Define octet rule. Write its significance and limitations.
Answers
The octate Value is the reaching of an atom to 8 that is the last electron get 8 so that it can complete all its shells.by that time it becomes charged
Definition :
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell.
significance and limitations :
(1) Hydrogen with 1 electron attains stability by sharing, gaining or losing 1 valence electron. It does not need to complete octet to attain stability. Also, He has only 2 electrons and is stable.
(2) Incomplete octet : In certain molecules such as BeH 2 , BeCl 2, BH 3 , BF 3 , the central atom has less than 8 electrons in its valence shell, yet the molecule is stable.
(3) Expanded octet : In certain molecules such as PF 5, SF 6 , IF 7 , H 2 SO 4 , the central atom has more than 8 valence electrons, yet the molecule is stable.
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