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What are the limitations of octect …

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What are the limitations of octect rule?
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Diksha Thakur 2 years, 6 months ago

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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