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Periodic Classification of Elements

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Periodic Classification of Elements: Let's explore Dobereiner's Law of Triads and Newland's Law of Octaves in this video! In the history of the Periodic Table, these were the initial attempts to group elements. We also discuss why do we need to classify elements and the need of a Periodic Table in Chemistry.
Try the Top 3 Questions at the end of video and write your answers and doubts in the comments below!
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5 сен 2024

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Комментарии : 1,4 тыс.

@Neeraj-yz9hp 2 года назад

1.Three triads 2.136 3.(i)The law succed only upto calcium element not further it (ii)There were no arrangement to add new discovered elements as Newland think that only 54 elements can be possible. Note: -2 Que explained , as if they are triads b=a+c/2 88 =40+c/2 88×2=40 + c 176 = 40 + c 176 - 40 =c 136=c... That 's all.

@user-lp1bu3gv2f 3 года назад

Q1) Dᴏʙᴇʀᴇɪɴᴇʀ ɪᴅᴇɴᴛɪғɪᴇᴅ 3 ᴛʀɪᴀᴅs ✓ Lɪ , Na , K ✓Ca ,Sr , Ba ✓Cl ,Br, I Q2 ) 40+ x/ 2= 88 x = 136 Q3) • it was valid for lighter elements i.e upto calcium (Ca) • He placed two elements in a single group (slot)eg: (Co , Ni) ; also the properties of Co and Ni were not matching in which he had placed with cl , br , I etc Thnku sir for giving us hw 💯

@thestrangeone7526 3 года назад

Hi sir ,you are the best teacher , And the answers for the homework questions are : I) Dobereiner was only able to identify 3 triads . ii) we know that (element A+element C)/2 = elements B (40+C )/2=88 40+C=88*2 40+C=176 C=176-40 C=136 Therefore answer is 136 iii) 2 issues in Newlands octaves were : a)it was only applicable till element calcium . b)newland assumed that only 56 element will exist and no another element will be found in future , but later when new element were discovered Newlands law of octaves became completely irrelevant BUT HIS LAW WORKED VERY WELL IN ELEMENTS CONTAINING LIGHT ATOMIC MASS.......... SIR THANKS A LOT FOR AN EXTODINARY SESSION .....

@PramodKumar-kr5vd 3 года назад

One of the best teacher I never seen sir. Thank u sir for providing some classes freely. Q 1. 3 Q 2. 136 Q 3. It is suitable upto calcium And two elements in one box

@abhzt 5 лет назад

You are the best teacher on RU-vid i have found till now!

@ManochaAcademy 5 лет назад

Thanks a lot :) Do check out my website : www.manochaacademy.com

@Sajid-sk8ut 3 года назад

Sir i am from kendriya vidyalaya. My science teacher sent this link to me for a good explanation. Thanks alot for your explanation.

@ManochaAcademy 3 года назад

You are most welcome

@senthilkumar8702 3 года назад

Lie

@senthilkumar8702 3 года назад

Why don't you brush your teeth Mr you teeth is in yellow color

@Sajid-sk8ut 3 года назад

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@Aish_2.0 3 года назад

@@senthilkumar8702 abe saale wo padha rhe hai to pad

@haripriyakolli813 2 года назад

1) 3 2)A+C/2=B 40+C/2=88 40+C=88×2 40+C=176 C=176-40 C=136 3)i. He kept two elements in same slot ii.his law was only applicable for 56th element that is calcium ii.

@gubbalasrinivas931 2 года назад

1) 3 triads 2) A+C/2=B 40+C/2=88 40+C=88×2 C=176-40=136 3)He plced two elements in the same slot The Newlands law of octaves is only valid till calcium

@a.pal_yt2018 3 года назад

My answer! Q1. Three traids, (average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element . ) Q2. We know that, average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element in order, let us assume C to be x, thus, (A+x)/2=88, (40+x)/2=88 or, 40+x=176,or, x=136u Atomic mass of c is 136u Q3. The two issues were - the table could be valid for the lighter elements till calcium (Ca) . There were only 56 elements discovered till that time (1866) but after the exploration of new elements caused issues and demerits of NewLands table. Edit : Thanks a lot! You are a true teacher 🙏🙏 You helped me memorising full book of science in a month.

@BirdGuy1928 4 месяца назад

Q1. 3 Q2. Approximately 136, because: (A + C)/2 = B Hence (40 + C) = 88 * 2 40 + C = 176 C = 176 - 40, Hence *C = 136* Q3. i. It only was applicable till calcium. ii. It put two elements in one box. iii. It only took into account the 56 elements that were then discovered, and when more were discovered, many elements could not be fit into the table.

@ashwinmanoj573 4 года назад

I was trying to help my son with the chapter. Stumbled on this video accidentally. Found it very helpful. Most striking thing is that it is explained in a very simple manner. Excellent work Mr_____. Sorry, don't know your name.

@ManochaAcademy 4 года назад

Glad it helped! My name is Sandeep Manocha

@teju4316 2 года назад

@@ManochaAcademysir I know that manocha but now I got to know that before manocha Snadeep is their

@firegamingadi4010 2 года назад

@@ManochaAcademy how to find out 2 question

@hackerclone1354 2 года назад

Let him study himself idiot.. he is in 10th std

@swayamjeetpadhi9303 Год назад

@@firegamingadi4010 Its easy Just add 40 and 88 40+88/2 = 64 Hope it helped

@lizzy8820 2 года назад

Ans 1. Dobereiner identified 3 triads Ans 2. 136 Ans 3. (i) It was applicable only till calcium (ii)cobalt and nickel were placed with elements like hydrogen, fluorine, chlorine, bromine, etc whose chemical properties are very different from that of cobalt and nickel

@yogeshpatidar6392 5 лет назад

Q1. Three Q2. (40+x)/2=88 40+x=176 ×=136 Atomic mass of 3rd element is 136. Q3. Only valid upto Ca and He assumed that elements are 56 in nature

@ManochaAcademy 5 лет назад

Super! All your answers are correct :) You can also try the Quiz for this video on my Website: www.manochaacademy.com/chapters/34/lessons/36 . Quiz button is below the video.

@shailendraduggal6570 4 года назад

Q1. 3 Q2. (40+x)/2 = 88 x = 136 Q2. a)The classification worked only on the first 20 elements. b)Newland adjusted two elements cobalt and nickel in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties from co and ni.

@lifevashii9931 3 года назад

Calcium was the 17th element at that time

@ranakaushik 10 месяцев назад

Answers: 1)Dobereiner identified 3 triads 2)Let us assume C=x Given A=40,B=88 According to question, A+C/2=B =>40+x/2=88 =>40+x=2x88 =>40+x=176 =>x=176-40 =>x=136 Thus, the atomic mass of the element C is 136 For checking, A+C/2=B =>40+136/2=88 =>176/2=88 =>88=88 Thus, L.H.S=R.H.S. 3)The 2 issues are: i)Newland thought that there were only 56 elements in nature. ii)The Law of Octaves was only applicable up to Calcium(Ca). I hope, that I have given the right answers.. I am from West Bengal..

@rufusbabu5434 9 месяцев назад

👏

@mysteryhours.9414 9 месяцев назад

🎉

@devanandata3807 2 года назад

2 nd answer is 136 let element C be x then , (40+x)/2 = 88 40 + x = 88 multiplied by 2 = 176 .'. x = 176 - 40 = 136 I came across various answers regarding this question , that's why I decided to write this comment along with its necessary steps . if u again put value 136 as x and again do the equation to check the answer you'll get as 88 . HOPE THIS HELPS 😌

@deepthideepthi861 2 года назад

Thank you so much for the explanation. ❤️

@samsteven6218 3 года назад

Sir thank you so much I was crying for my tomorrow's chemistry exam....... My senior suggested this RU-vid channel........ Thanks a lot sir..... I'll share this channel in my class sir.... Once again thanks for infinity times......

@ManochaAcademy 3 года назад

Most welcome

@deshpande7985 4 года назад

Now it is exams time so I didn't understand the concept related to this..And I searched in youtube and found ur video... It's really easy for me now..Thank u

@ManochaAcademy 4 года назад

It's my pleasure

@rakshakumari7534 4 года назад

One thing which is awesome about you is you never post very long duration videos...well I easily get bored while watching long duration videos😅so I prefer your videos for understanding several topics...thank you sir

@ManochaAcademy 4 года назад

Thank you so much 😀

@royhanasultana699 4 года назад

Sir ....frm u...am really become a good speaker....in English much better than before.... because u teach as excellent as u speak.....

@ManochaAcademy 4 года назад

Glad to hear that. Keep watching and do share with your friends

@khagendranathsarma1080 4 года назад

Mee too....

@thegreatgamer2236 3 года назад

Chip laudi

@jyotirmaytripathi3331 3 года назад

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@adityasatishsonawane5868 5 лет назад

I had never seen such perfect explaintion in any video of you tube awesome sir you are very talented and know how to express own knowledge....awesome sir thank you so much sir.....💝💝💝💝💝💝😘🇮🇳👍

@ManochaAcademy 5 лет назад

@harshad dhanke, Thanks a lot :)

@bandaruapparao5940 3 года назад

A1-3 triads A2-136 A3-in the time of newland there were only 53 elements, and when new elements are discovered the properties of those new elements didn't match.......... Sir the concept is crystal clear to me Thank you sir.

@harshinishashi4233 3 года назад

A3 - It's 56 elements not 53 elements dude

@prafulk1833 4 года назад

Sir you are my favorite teacher all your video are fantastic all concepts of newland law of octaves and Dobereiner's triads are clear to me THank you so much sir !

@ManochaAcademy 4 года назад

Keep watching

@nirvaansharma934 3 года назад

Q.1 Dobereiner identified 3 triads Q.2 A+C/2=88 40+C/2=88 C/2=88-40 C/2=48 C=48×2 C=96 Q.3 2 issues with newlands law of octaves were that: (i) He stated that only 56 elemenys existed in nature and no more were to be found. (ii) Fe was placed far away from Co and Ni whereas they have similar properties. (iii) The Law of octaves was applicable only till Ca.

@probrogamer1736 2 года назад

Q1. 3 traids Q2. 136 Q3. The limitations of Newlands law of octave are. i. The table was only valid till calcium ii.he assumed that there are only 56 elements in nature. iii.he put two elements in one slot.

@sourikmondal3921 2 года назад

Yes you are right bro in the second question. Most of the students are writing 5 64 but these dumbs didn't understand the question properly.

@muthulakshmi207 3 года назад

Q.1 dobereiner identified only 3 triads 0.2 atomic mass of 3rd element is 64 Q.3 1 issue: The table was only valid till calcium. 2 issue was: he assumed that there are only 56 elements there in nature Lastly i would really thank you for explaining this topics in a simple way i really loved ur explanation I have test today i was really confuses of this topics..But now i am crystal clear.. Thanks for your big support 🤩

@ishu_the_firefly Год назад

1 - 3 Triads 2 - 136 is the At. Mass of element ' C ' 3 - a) Newland's law of octave worked quite well for the lighter elements but did not work with heavier elements , i.e., those lying beyond Calcium. b) he adjusted 2 elements , Co & Ni in the same slot & these were placed in the same coloumn/group as Fluorine , Chlorine , & Bromide which have very different properties than these elements

@avskushal6402 2 года назад

These are the answers for your questions sir 1 -3 2-40+88/2 is equal to 64 3- it is worked for only lighter elements till ca he assumed only 56 elements in nature Thank you sir this helped me a lot thank q..

@adarshraj4696 2 года назад

B = A+C/2 so B x 2 = A+C 88x2 = 40 + C 176 - 40 = C Hence, C = 136

@gooooooooooooooooooooooo 2 года назад

@@adarshraj4696 yess but I did like 40+c/2=88 So 88-40=c/2 48*2=c C=96 Is this right 🥲

@adarshraj4696 2 года назад

@@gooooooooooooooooooooooo i have not perfect reason why this wrong but 40 is also in division so we can't directly move one value. either we move whole numerator to right side or denominator.

@bgmstation8772 2 года назад

@@gooooooooooooooooooooooo no broh!.. We can't take the 40 like that

@lakshmivennela2576 4 года назад

Thank you sir I like your way of teaching it was excellent

@ManochaAcademy 4 года назад

Thanks and welcome

@ranjitsinghmanhas5151 2 года назад

Sir u teach very well other teacher take 2hr to teach u explained beautifully in just 12 min Minblowing 🎉🙏 keep going sir

@ManochaAcademy 2 года назад

Thanks for liking

@nithinsai-jp1lh 8 месяцев назад

1) Dobereiner had 3 triads 2) my guess the third c is 137 because 137+40 is 177 so 177/2 is 88.5 average B is 88. 3)a)there are two elements in one slot. b) There are only 56 elements in Newlands laws and the property in which 1st elements property is same as 8th elements property didn't continue the in the other elements.

@gedamuteshome3713 5 лет назад

it is intersting vidio and thank you for your explanation Top 3 question concerning about periodic table Q1 Three B/c law of triads means 3 elements Q2 according to Doberner law the atomic mass of the middle element is the avarage of the frist and the therd incas atomic mass ofA+atomic mass of C divided by two gives B massB=massA+massC/2 88=40+mass C/2 88×2=40+massc Mass of C=88×2-40 136g/mole Q3 1)He pleaced two elements in one place 2) the law applicable for only light element

@ManochaAcademy 5 лет назад

Happy to hear that you liked the video! Thanks :) Very good! Answers of Q2 and Q3 are correct!! Q1 answer is 3 because Dobereiner could identify only 3 groups (triads) at that time (see the 3 triads in the video). Each triad contains 3 elements. Also try the Quiz for this video on my Website. Quiz button is below the video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves

@HARISH-yr4dg 2 года назад

2Q) A=40, B=80, and C=x A+C÷2=B 40+x÷2=88 40+x=88×2 40+x=176 ×=176 - 40 =136 simple answer

@shwethaanand8185 3 года назад

Q1 = 3triads Q2 = 136u Q3 = it was applicable till calcium and Co and Ni are placed in column of F , Cl and Br which is not having similar properties And Thank you sir ☺️☺️

@edmondlubyayi941 2 года назад

Q1. Three triads Q2. 136 Only valid till Calcium He assumed that there were only 56 elements in nature He put two elements in one slot

@shobhanataraj4225 3 года назад

Q1 3 Q2 136 Q3 upto calcium there was only applicable of resembling eigth element And There were cobalt and nickhel in the 1st slot, which does not has the propeety of that slot

@jessicathakur8129 5 лет назад

1. 3 triads 2. let the atomic mass of the third element be x therefore, A/Q, ___40+x___ = 88 2 => 40 +x = 88 *2 => x= 176 - 40 = 136 therefore the atomic mass of the third element is 136 3.two issues with Newland's law of octaves are: a) he grouped elements having different chemical properties together and elements having similar chemical properties far away. b) he thought that only 56 elements existed in nature and no other elements would be found later in the future.

@ManochaAcademy 5 лет назад

Super!! All your answers are correct :) Also try the Quiz for this video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves

@alibhaiofficial9465 5 лет назад

here what is the meaninig of A/Q?

@dikshaborthakur2154 5 лет назад

A/Q means according to question

@shiekhtanzeem 5 лет назад

You Have Best Teaching Way And Excellent Explaining With Your Vdo

@ManochaAcademy 5 лет назад

Great to hear that you liked the video :) Thanks a lot!! Do check out more videos at www.manochaacademy.com

@ayushmondal8514 4 года назад

Sir you are the best teacher

@ManochaAcademy 4 года назад

Thanks

@zixtro7568 4 года назад

Yeah bro..

@vaishnavkk9689 3 года назад

Thanks sir for your wonderful explanation I will definitely share this video to my friends also

@ManochaAcademy 3 года назад

Always welcome

@janardhankadakeri950 4 года назад

Super explinationn way i understand very very well thank u so much sir please do more videos don, t stop the way u helping like me many students

@ManochaAcademy 4 года назад

Keep watching

@dharavathsomulusarojasathv9178 Год назад

Sir I am very thankful for this video it is helping me very much In our school I listened it's not understood by me

@atiqurrahman4088 Год назад

Q2 64. 132, 128 etc is the wrong answer plz check A = 40 B =. 88 C =. ? Actually B the middle element is the average of 1st and 3rd element A and C as explained in Dobereiner s Triad .. So, A + C / 2 = B If we put the Values we have, 40 + C. / 2. =. 88 Cross multiplication will give, 40. + C. = 2 * 88 40. +. C. =. 176 C. =. 176.- 40 =. 136 So, atomic mass of C should be 136 is the right answer.. Verify it as, A + C / 2 = B 40.+. 136 /. 2.= 88 .

@V.Ajantha666 Год назад

Toper anni antarura babu

@dr.kailashbaboo1445 4 года назад

Ans .1 = 3 triads Ans .2 = 64 Ans .3 = a) = only valid till calcium b)= put two elements in one slot . Amazing explanations .👏

@luqmaansacad2776 5 лет назад

Thanks teacher keep going from somalia one love

@ManochaAcademy 5 лет назад

Happy to hear that you liked the video! Thanks :)

@TekuHilda-vl9hp Год назад

Q1. He identified 3 Triads Q2. C=64 Q3. a. He put two elements in one spot. b. Newland assumed that there are only 56 elements in nature. c. Only valid till calcium (CA).

@AURKODAW Год назад

answer in 136 for the 2nd one

@sathishsk1605 3 года назад

Q1.there were only 3 triads Q2.Z of C element is136 Q3. 1.this law is only valid till calcium 2.Newlands had designed his octave table for only 56 elements but after this table many elements had discovered for that discovered elements octave rule is not suitable Please check my answers whether these are correct

@harshucreationrisod3203 5 лет назад

You teach the various concepts practically hence we can understand easily

@ManochaAcademy 5 лет назад

Thanks a lot :)

@mrsham100 3 года назад

@@ManochaAcademy sir Hindi me bhi bolo

@mainaksarkar1347 4 года назад

Sir your explanation clears all my doubts. Sir really you're awesome 👌👌👌👌

@ManochaAcademy 4 года назад

So nice of you

@mrsham100 3 года назад

@@ManochaAcademy Hindi bhi plzzz

@margesanr6171 4 года назад

Sir ur teaching is simply superb and I subscribed only ur channel in you tube ....thank you sir..

@ManochaAcademy 4 года назад

Thanks and welcome

@prakasamv2364 4 года назад

☺

@adityasinghtiwari5087 5 лет назад

Wao sirrr I am so happy 🤗🤗🤗after long tym.. Sir plzz your video is really v. Helpful for understanding easily plzz its my request make more video

@ManochaAcademy 5 лет назад

Thanks a lot! Happy to hear that you like the videos :) I'll definitely upload more videos!

@ceeyar2003 4 года назад

Answers: 3 triads 136 Worked only for the elements till Calcium; he assumed that there were only 56 elements in nature, so all the elements which came after that did not fit in the table Thank you so much! your videos are helping a lot during this lockdown...

@ramyaravichandran9414 4 года назад

This concept is really difficult sir but u taught very easier........thank u sir🥰 keep rocking sir

@ManochaAcademy 4 года назад

Most welcome 😊

@sujatamuddu4109 4 года назад

@@ManochaAcademy s sir

@sathiyaseelanj9528 4 года назад

Very nice teaching sense sir I understood very richly in the lockdown period.👍👍👍👍👍👍👌👌👌👌👌👌🙏🙏🙏🙏

@ManochaAcademy 4 года назад

Great

@tarifahmed02 4 года назад

@@ManochaAcademy sir u did not reply to the answers.......

@madhan4975 3 года назад

Top 3 Questions {My Answers} 1) Dobereiner identify 3 Triads. #Lithium , Sodium , Potassium. #Chlorine , Bromine , Iodine. #Calcium , Scrontium (In book) and Barium. 2)B = A+C/2 = B×2-A= C => 88×2-40 = 176-40 = 136 3)Drawbacks of Newland's Law of Octaves : #In the place of one element , he placed two elements. #His law can only acceptable to lighter elements. #He placed Iron {Fe} in a wrong place , which means Fe cannot be have the same chemical properties of other eight elements on the table. Eagerly waiting for your Reply Comment Sir.

@lakhangoundhare5448 3 года назад

👏👏👏

@rajumm9284 3 года назад

It's strontium.... I think ur book is wrong... Good answers...

@anweshsatyasundarpatel3662 3 года назад

Q.1.3 2.137 3.i-Only valid till calcium ii-Put 2 elements in one slot. Excellent sir and thank you

@haobansan7572 4 года назад

Q1 - 3 triads Q2 - C=136 Q3 - 1=only valid till Ca(calcium) 2=he assumed that there are only 56 elements in nature and when more elements has been discovered, they did not fit the newland's law of octave.

@ashrith4148 3 года назад

I love your your teaching very much sir. Its very easy to understand your classes than our teachers teach. Thank you very much sir, Q 1:- 3 triads Q 2:- 136 is the atomic number of element C Q 3:- 1 - Newland's laws of octaves rule is only correct upto Calcium and 2 - he placed two elements in one box Ex:- Cobalt and Nickel & Cerium and Lanthanum in one box.

@ashrith4148 3 года назад

Sodium(Na) was the 9th element at that time (Newland's laws of octaves)

@altafjahangir496 3 года назад

Q.1 = 3 Traids, Q.2 = 136, and Q.3 = Newlands assumed that there are only 56 elements in nature, only valid till Calcium (Ca), put two elements in one slot like Co and Ni and Ce and La which were not supposed to be in it........ answer from Tanaaz.J

@abdulyazeed3208 2 года назад

Sir i am child of class 10.when my teacher take this lesson I don't understand and in the mid term exam I simply sitting on exam hall. When I saw this class it is wonderful. It was a nice by manocha sir. Keep upload more lessons. Faithfully thank you

@sanjayshrivastava9510 5 лет назад

Sir , please make the video on mendeleev 's & modern periodic table pllllllllllllzzzzzzz

@krishbhandari8889 4 года назад

Thankyou for your time sir and your teaching skill make me your fan. I am the biggest fan of yours. You are the best teacher I ever seen.

@ManochaAcademy 4 года назад

It's my pleasure

@dharmatejaattada7960 4 года назад

Sir I like your teaching That I could understand every topic easily

@ManochaAcademy 4 года назад

Glad to hear that

@skdb17 3 года назад

sir your teaching is so nice and it just makes the concept clearer and easier for me.

@tanvimanchala4485 3 года назад

Sir I had an head ach when I had a test I saw your vedios and got a clarity THANKS SIR 👌 🙏

@ManochaAcademy 3 года назад

It's my pleasure

@tanvimanchala4485 3 года назад

Thanks a lot sir 🙏🙏

@venkataramana8994 3 года назад

1-5 2-(40/2+x/2=88)=(x/2=88-40/2)=(x/2=68)=(x=68×2)=(x=136)• 3-it was found that the law of octaves holds good only for the elements up to calcium.Sertain elements, totally dissimilar in there properties,were fitt into the same group.

@Rashmithisside 10 месяцев назад

1.3 2.136 3.•only valid till calcium •two element are placed in one slot •newland's assumed that there are only 56 elements in nature

@shrishtisingh0001 3 года назад

Answers for the top three questions :- Ans:1:- Dobereiner identified only three traids out of the known elements. Ans:2:- Elements:A, B, C. According to Dobereiner, (atomic mass of A + atomic mass of C) / 2 = atomic mass of B 40 + atomic mass of C = 88 *2 Atomic mass of C = 176 - 40 Atomic mass of C = 136 And:3:- Issues with Newland's Law of Octaves :- a) Newland's Law of Octaves was valid for elements upto Calcium only. b) He assumed that only 56 elements are present in the environment and no more elements would be discovered later.

@chaithanyask6255 8 месяцев назад

Sir u teaching is fantastic 😊

@ManochaAcademy 8 месяцев назад

Thanks a lot 😊

@TheRadhikamusic 4 года назад

Perfect explanation... thankyou sir!! 1) 3 triads 2) 136 3) two elements were placed in the same column and also those elements differed from the other elements in the column in its properties. And the table was valid only for lighter elements until Calcium ..Newland assumed that only 56 elements existed in nature,which was wrong .

@xo_playz-695 2 года назад

I like your teaching skill. And I shared your your channel's link to all my friends. Thanks for teaching in this way.. 🙂

@ManochaAcademy 2 года назад

Most welcome

@SakshamTashi 2 года назад

Answer: 1) 3 triads 2) 136 is atomic mass 3)A) Laws of octaves worked well till calcium only, B) Newlands assumed that only 56 element existed in nature, but new element came up and doesn't fit into law of octaves.

@jpkl4766 2 года назад

😃

@kripasindhugayen9089 4 года назад

1. 3 traids 2. C-136 3. Newlands law of octaves only applicable up to calcium. Newlands assumed there are only 56 elements in nature but later new elements were discovered which is not fit into law of octaves.

@poornimagunda7911 3 года назад

1. 3 2.136 3. It was a issue of an 56 elements but there were more discover of elements in future it was not fixed for his table

@divya_sree0789 3 года назад

Nothing to say.......except fabulous explaination....... ❤️

@ManochaAcademy 3 года назад

Thanks

@subhankarsg7313 5 лет назад

with this video all my queries are all solved .......... Thank you sir . Now I can score good marks in my test..... thank you so much ..

@noob-wr1wi 4 года назад

Sir,Ur teaching is very good U need millions of subscriber

@ManochaAcademy 4 года назад

Thanks a million

@chinnarc0075 Год назад

Yous explanation is super and I AM impressed 👍👍

@yogitamopagar1186 4 года назад

Sir because of your excellent teaching our school is providing your videos in lockdown... Thanks a lot sir🙏👌👌👍

@ManochaAcademy 4 года назад

It's my pleasure

@aadyaparadkar9917 3 года назад

Q1: The no of triads identified by dobereiner was 3 Q2 average of A and B = Atomic mass of C 40+88/2=128/2=64 Q3 1. Newland law of octaves was only applicable till calcium 2. At that time only 56 elements were known so the Newland law of octaves was applicable only till the 56th element. It worked well only with lighter elements which is till calcium.

@tabrej10 3 года назад

Well explanation

@ManochaAcademy 3 года назад

Thanks for liking

@arpitaanand3593 3 года назад

SIR I always like your vedios .*THANK YOU SIR FOR TEACHING US PRACTICALLY ALL THE CONCEPTUALTHINGS*

@ManochaAcademy 3 года назад

It's my pleasure

@HMK.26 10 месяцев назад

Answer 2nd is A=40 B=88 find C so that 40+88=128/2 = 64 the correct answer

@ART_15477 4 года назад

Q1 3 triads only Q2 64u [as you have said that in the triads the average of 1st and 3rd is approximately equal to atomic mass of 2nd element] Q3 {a} Newlands thought that there were only 56 elements in the nature which was a false statement when further research took place . {B} his theory of octaves stood true for only lighter element till calcium

@shivanginisingh6398 4 года назад

Same here

@janardhanareddyd3729 4 года назад

You teaches very well sirr

@ManochaAcademy 4 года назад

Glad you are liking it.

@anm13682 5 лет назад

Excellent quality of video and Nice explanation

@triplehustler8331 4 года назад

Questions . Q.1 ans..3(three) Q.2 ans. given=A=40,B =88 To find: C Proof: B=A+C/2 88=40+C/2 88*2=40+C 176=40 +C 176-40=C Or. C =136.....ans Q3. Ans..1=only valid to calcium. 2=Newland assumed. That there are only 56 Elements in nature . 3. He also put two Elements in one slot.

@triplehustler8331 3 года назад

@praazhnaashre channel don't worry dear....a human is the egiffy of mistakes........! 😀

@kiranbudhrani7609 2 года назад

1. Dobereiner could identify 3 triads. 2. I got the answer as 136 3. the laws or properties stated were followed until calcium, two elements were added together in one slot and iron (Fe) which is related to these elements was situated very far. Also later when more elements were found, even they couldn't fit in the table.

@sithalc9742 Год назад

Answers for the top three questions. 1. He identified three triads. 2. 136. Working => 88=40+C/2 ---> 88 x 2 = 40 + C -----> 176 = 40 + C -----> C = 176 - 40 = 136. 3. These laws were valid only till Calcium. Dissimilar elements were fitted into the same slot.

@santoshgarg7682 4 года назад

Sir your teaching is very nice thanks for explaining this concept .my concepts are cleared by seeing ur video

@ManochaAcademy 4 года назад

Glad to hear that

@dietrash Год назад

Q1 - He identified 3 triads Q2 - 64(as 80+44/2 is 64) Q3 - 1 - He inserted 2 elements is same spot(in specific cases like Co and Ni) 2 - he assumed there were only 56 elements in nature

@atiqurrahman4088 Год назад

Q2 64 is wrong answer plz check Actually B the middle element is the average of 1st and 3rd element A and C.. So, A + C / 2 = B If we put the Values we have, 40 + C. / 2. =. 88 Cross multiplication will give, 40. + C. = 2 * 88 40. +. C. =. 176 C. =. 176.- 40 =. 136 So, atomic mass of C should be 136 is the right answer.. A + C / 2 = B 40.+. 136 /. 2.= 88 .

@deekshakrishna8764 3 года назад

THANK YOU SIR.....I WAS ABLE TO UNDERSTAND ONLY THROUGH YOUR VIDEOS

@ManochaAcademy 3 года назад

Glad to hear that

@sridevigudipati5807 3 года назад

Tq sir😎

@nilimanath3182 4 года назад

1. 3 triads 2. 136 3. (i) Newland's law of octave act true only for elements up to Ca . (ii)The elements that were discovered later could not be fit into the pattern.

@SanjayGupta-js7yf 3 года назад

Your practical version is super cool then other youtubers lecture

@ManochaAcademy 3 года назад

Thanks for liking

@anshyadav6096 5 лет назад

sir we want more videos from you

@ManochaAcademy 5 лет назад

Thanks! I'll definitely try to put more regularly :)

@veerashribhosale.6007 3 года назад

1.)He found 3 triads among the elements known at that time. 2.)C = 136 3.)(a)Newlands law of octaves worked only upto calcium.(b) He placed two elements in the some boxes in order to match the properties.(c) He did not keep place for the new discovered elements.

@tanishaarathore3141 2 года назад

Ans.1 3 traids were identified by Dobereiner. Ans. 2 136 is atomic mass of C. Ans. 3 1) 2 elements are put in one slot 2) only valid till calcium Ca

@rameshkumarsrinivasan4395 4 года назад

1. Do Re Mi Fa So La Ti Do - Tonal scale for Do 2. Sa Re Ga Ma Pa Da Ni Sa - Carnatic scale for Sa 3. C D E F G A B C - Western scale for C Major. 4. M T W Th F Sa Su M - Days in a week You can chose the type you like. i choose the third one because I've been learning western music since childhood.

@Prowl-b2v 3 года назад

1) Dobereiner discovered 3 traids 2) C will be 136 calculation :: (40+c)÷2=88 40+c=176 So ; c=176-40 which is equal to 136 3) cobalt and nickel had put in the same slot that is in the column of F; Cl and Br which is very different from Co and Ni And newlands law of octaves is valid Only upto Ca beyond Ca it is not applicable