Elements and atoms | Atoms, compounds, and ions | Chemistry | Khan Academy 

i just learned more from a 13 minute video then i did in my entire school year relating to science so thanks!

i mean why can't all teachers do what he does. he takes you to the fundamental part of it and explains it like no one could. i just love the academy.

If he is using a mouse and not a pen to write on the images, he is the highest ruler of everyone who tried to use MS paint with a mouse

Hey ya'll -- to those watching--- i also find Khan Academy phenomenal as far as teaching style and their ability to present a concept in the most basic (sometimes story telling form) that makes us realize the types of teachers we've had in the past and allows us to go back in time and learn the very basics of something we dropped along our path of education, simply because we thought "oh i'm not good at science" or "im not good at math"....Math & Science are the foundation on which this universe came to existence and continues to exist...to study it is a must, to understand it is a major challenge especially those prone to the artistic aspect of life, but how much more enlightening and enhancing do things get when we can intersect the two worlds because we have just gained new knowledge. Khan Academy has the capability to do that.... I watch their videos even when i dont have to prep for anything, just for enjoyment of learning something new..... I do very much love this channel and as much as i wish i could be a monthly contributor, at the moment i will contribute in small amounts when i can as i do believe we ought to support those who put in the effort to give us high quality education. So please consider donating as well, even if 1000 of us donates just $5 per person, that's a good chunk of money....We push for Free Education in United States through our accredited schools -- be it ivy league or non ivy league.....Khan Academy's education is on par with Ivy League and frankly speaking they are indeed providing the education we need....they have the ability to help people connect the dots in simplest forms.....so please support them!

Can you please make a lecture series on Quantum Physics. Everybody would love that. Thanks.

You can tell that he really loves what he does. And when your teacher really enjoys what they are teaching, the subject becomes a lot funner to learn! ;) thanks

Every Khan academy video's comment section be like: OMG I literally learned more in this 13 mins than I learned in 100 years in school.

i'm a grown up trying to learn basic chemistry. thaks, sal. this is very helpful.

I hated Chemistry in school, but today, on Saturday I wanted to watch some videos and... it is so interesting and easy learning for me) Thanks khan Academy :)

This is something that schools ask you more questions about directly than actually giving an answer to the class. Even if the professors do, they just never actually make the answer clear at all. I learned something from this that my High School teachers failed to get across.

Sal is the best teacher I have ever seen in my life.He knows how to represent any topic in a unique way.

If he was my teacher, I would've loved chemistry.

I absolutely love this guy! I have enjoyed every single video I have watched of his. What a fantastic teaching style! I would love to actually have the opportunity to talk with him in person. Please keep up the great work! You are making a difference!

These lessons are history in the making! In the name of humanity THANK YOU Khan for what you are doing.

If you're here, either your teacher can't teach or you're watching this the night before your exam because you didn't study.

This is the first time I've ever been excited about Chemistry (after college- entering Medical school), thank you for your videos !!! They're amazing.

The people who disliked this Video must be teachers

Everything gets amazingly entertaining with Khan Academy ! I am already excited about learning Chemistry. I am going to devour your videos ! Thanks a lot for the quality material !

Sal's an amazing teacher, and his voice is so relaxing to listen to - which plays a big part for me and learning becomes fun in this way!

He speaks with passion

I am seriously not lying you are 💯 percent better then my science teacher, literally u explain everything in few minutes which I understand but when my teacher explains in 2 hours I can't understand anything!

after a 7 years of time , It all feels nostalgic and chemistry was my favorite subject back in school days

God, I love Science! Thank you sir!

I love how his voice is so exciting and keeps you interested! Good enthusiasm & cute voice! :)

I can't wait to enroll at Oxford within the next 5 year's time

Seriously you rock! I could not learn this stuff in school, teacher also sucked, ended up dropping out! I'm doing biology correspondence now and this is so much easier to follow and understand! So much easier then reading each chapter of Prentice hall, I retain so much more information when I listen to you!

0:00 there are different substances 0:42 1:14 ❤1:49 elements ❤2:42 elements are made of atoms 3:16 4:42; 5:07 ❤5:20 6:30 it's interesting why they call it atomic number not proton number 6:42 6:56 8:33 9:26 9:57 ❤11:12 11:48

I was going to make a chemistry joke (which are tin out of ten) but all the good ones Argon. Don't like my jokes? I think that they're worth their weight in gold.

I already know most of this, but I like watching it anyway just because Sal's voice and way of explaining is so pleasant to listen to.

Learned more from this video then I did in my whole life.

I think that's easy to know because he teaches us easily and uses the simply words which let us have a good understanding.

Thank you for posting this in a free format. Very helpful.

I am really happy to learn chemistry because you have explained very nice so i have interest in chemistry so thanks !

Hahah ! My Chemistry teacher gave up teaching us and gave your website to students, and ask us to learn from you. Now I think you rule all teachers x) You rock @@

Wonderful presentation! SO GRATEFUL these Khan videos are ad-free! Thank you!!!

This guy literally teaches every subject on earth, he is a solid match for the Wikipedia writer who wrote somewhere around half the wiki articles

Such a nicely described video, and it is available for free! Great Work Khan Academy! Thanks

I love how he answers all your questions without you asking them, in all his videos

Okay i need to watch all his videos

Fuck yea, new chemistry playlist just as I start chemistry :D

All right. I just learned way more in this video than entire physics class about chemistry. Thanx

Science Teacher: *Hands out science assignment* Me: Ahh, khan academy. How you doing?

This is awesome.

Note for self - left off at 6:02

you did give correct information keep doing what your doing

Have you considered a series on neuroscience?

Thanks. Very simple to understand. My Instructor gave us to use.

Thank you a lot! I now understand my chemistry and physics books a lot better!

well sasl...then do a playlist on atomic spectra in chemistry....

I've literally learned to love Science because of Khan Academy

Thanks this video really helped me a lot

A lot of information to be learned here. Unfortunately, our math is slightly off. And with that realization, how far have we spiraled off course?

Just found your videos! Omg! I’m getting ready to go into pre-nursing and have forgot all this stuff!! Great information and by January 2019 i feel confident I’ll be ready for my pre-req. classes! I’ll be watching all your videos that relate to my needs. Thx!!

How is Carbon-12 defined by the number of protons, and oxygen not? 11:05

good overview. i like the relaxed approach.

I just wanted to say these are some pretty good tutorials on chemistry.

@khanacademy This video was so helpful! Could you please do a video on Isoelectric Ions? Isotopes? And how to calculate the number of p, e, and n in particular isotopes?

This video rocks like its already 12 yrs since its uploaded and still people found it helpful

Khan academy is such blessing when you just don't want to learn line by line from book. Respect from pakistan❤

have a science test tommorow on chemistry instead of reading the book..im watching khan academy.. FTW :)

Ah why aren't you my Chemistry Teacher!? :( I've been sitting in a Chemistry class half a semester not understanding anything & know it's kind of starting to make sense with the first video:O

_SUMMARISED by GPT-4:_ 1. *Elements are pure substances with specific properties.* Examples: Carbon, lead, gold. 2. *Water, historically considered an element, is made of hydrogen and oxygen.* 3. *The periodic table lists all known elements.* - Elements are defined by the number of protons they have. 4. *The most basic unit of an element is an atom.* - Atoms are incredibly small; a million carbon atoms can fit across the width of a human hair. 5. *Atoms are made up of even more fundamental particles:* - Protons (define the element) - Electrons - Neutrons 6. *The nucleus of an atom contains protons and neutrons.* - Electrons move around the nucleus. 7. *Protons have a positive charge, electrons have a negative charge, and neutrons are neutral.* - Unlike charges attract each other, which is why electrons don't just fly away from the nucleus. 8. *The number of protons in an atom defines the element.* - Changing the number of protons changes the element. 9. *Electrons can be taken away by other atoms, leading to chemical reactions.* - This forms the basis of chemistry: understanding how atoms of different elements interact based on their electron configurations.

You really explain and break down the information that is required to understand the basics of chemistry, instead of the school/education system making the whole subject extra complicated for no reason apart trying to limit the knowledge to maintain control , and limit access to everyone, they understand power is nothing without control, so controlling the knowledge is controlling the people, ! Thanks and blessings to you

Thanks Khan you seriously have changed my life. I love science!

i have always loved chemistry and when i want to learn it always gets so. Boring !! blah blah this video is super inspirational and i've leaned so much in short time because you are taking it to another level of explanation... which makes it so exciting thank you so much ! Finally a really good chemistry teacher !!! hooray!! please continue i will sign up to the learning website in this video ..

In another video I was going to say that I wish I took chemistry at school but now I think it would not of been as interesting to me as Khan video lessons. With the video I can watch it again if I don't understand something the first time.

Thank you. I cannot word my gratitude.

This man knows everything!! XD thank you soooo much.

Do you have a video about naming elements? I have trouble when using -ide -ate -ite, -nic when elements become polyiodic or compounds

Thanks, this really helped.

please pray that i pass this chem test 😭

@AUNKProductions Gravity is actually too weak to hold protons together. Nuclear force holds the nucleus together (easy to remember, huh?) Gravity is actually the weakest of the four forces: gravity, electromagnetic, strong nuclear, and weak nuclear force.

is this really the beginning?? As in the basics of basic? if so, I'm so screwed.

thank you for translate

is there a way to memorized everything that he just say? My school tend to give out quizzes and exams regarding about these videos. Is there a way where I can have access to the whole caption of his speech?

Electrons stay there with gravity. 4 forces :- electromagnetism, gravity weak & strong nuclear force

Fantastic i can make up for all that information i missed in chemistry class...

hank you Khan academy! Great job on free availability to knowledge without advertisement!!

Khan academy is doing really well

A pessimist sees a half filled glass as glass half empty ,an optimist sees the half filled glass as half filled,a chemist sees the half filled glass as completely filled ,half in the liquid state and half in the gaseous state.

Thank goodness for Khan academy. it helped me so much more than school XD

I am having problems with school and when I look up my problem on RU-vid and see a video by Khan Academy I get so excited!

i think i'm gonna cry! i finally understand this!! thank u very much!!! :')

AWESOME CHEMISTRY.

thx so much i have a big unit test tmr in science and this helped a lot

Looking to refresh my organic chem (as well as some basic chem). That being said, how many lessons or WHICH lessons should I do befor jumping back into O-chem?

Just 😍 I didn't llike science But Now I love it ❤

Helped so much. Thank you so much!

I think the Pauli exclusion principle is why the electrons don't just fall into the center. Not sure if that's completely true, ... it's a quantum mechanical principle and outside of the scope of this lecture. Not that I myself even completely understand it, just remember someone mentioning it before. Nice intro Khan, love the work you are doing. Stay humble, be blessed, and Godspeed.

I'm literally up 3 hours before my final watching your videos. Thanks so much!

A good video illustration to explain and illustrate the concept behind the introduction of organic chemistry. But how about the common questions related in school exam?

This is a truly informative experience, khan academy has helped me throughout all these years, thank you.

if u thk this piece of information is useful, plz "thumb up" so more ppl would know^^

He is our teacher. Khan is teaching us right now.

I LoVe Science

I am praying I am not the only college student here struggling to understand the difference 😂

wow, you actually make science sound interesting, and that my friend is difficult!

I appreciate the video it teaches me good things

u are a wonderful teacher sal, very commendable

Khan Academy always gave us incredible videos!