Question

explain about octet fuel
class 11​

Answer 1

Answer:

According to octet rule, atom tends to have 8 electrons in the valence shell to attain stable configuration.

Significance: It explains the reason behind the chemical combination of different atoms to form ionic or covalent bond.

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.

Explanation:

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