Question

Define octet rule. Write its significance and limitations.​

Answer 1

octet rule was used by a scientist to classify elements

this law states that after every 7th elements the 8qh element have similar properties as the 1st element

Answer 2

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 BeH2 , 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 , H2 SO 4 , the central atom has more than 8 valence electrons, yet the molecule is stable.

hope it helps you mate.

@ ANUSHA ❤✌