00:02 One Shot Revision of Classification of Elements & Periodicity 02:03 Classification of elements is about grouping elements based on similar properties and characteristics. 06:17 Newland's Law of Octaves is about the repetition of properties every eighth element. 08:29 Newland's Law of Octaves and Mendeleev's Periodic Table 13:33 Mendeleev's organization of elements into vertical columns and horizontal rows 16:06 Mendeleev's corrections and predictions of new elements 19:56 Explanation of Mendeleev's Drawbacks and the Cause of Periodicity 21:45 Introduction to Modern Periodic Law by Henry Matters 26:13 The sixth and seventh periods have Lanthanide and Acton Ids. 28:19 Periodic table arrangement of metal, non-metal, and semimetals 33:06 Classification of Elements & Periodicity in Properties 35:08 Discussing electronic configurations of d-block and f-block elements 39:19 Atomic size increases down a group and decreases across a period. 41:23 Ionization enthalpy is the energy required to remove an electron from an isolated gaseous atom. 45:29 Nonmetals are found in periods and have higher electron gain enthalpy. 47:34 Electronegativity trends in Periods and Groups 51:52 Exceptions in electron gain enthalpy and ionization enthalpy 53:49 Valence electrons and periodic trends 58:41 Diagonal relationship between period three elements 1:00:37 Encouraging interaction and feedback from viewers
No but there are 32 e- in 5th and 6th period this is because of the lanthanide and actanide series 😊😊 no offense bro just genuine concern may be you tick the wrong option in your exam
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