Which of the following does not obey the octe | vedclass

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(D) The octet rule states that atoms tend to gain,lose,or share electrons to achieve a stable configuration of $8$ electrons in their valence shell. $

Vedclass · Accepted Answer

$CO$ and $PCl_5$

Vedclass · Answer

(D) The octet rule states that atoms tend to gain,lose,or share electrons to achieve a stable configuration of $8$ electrons in their valence shell. $CO$ (Carbon monoxide) has a total of $10$ valence electrons ($4$ from $C$ and $6$ from $O$). In the structure $:C \equiv O:$,the carbon atom has only $6$ electrons in its valence shell,which is an incomplete octet. $PCl_5$ (Phosphorus pentachloride) has $5$ valence electrons from $P$ and $5$ from $5$ $Cl$ atoms,resulting in $10$ electrons around the central $P$ atom,which is an expanded octet. Therefore,both $CO$ and $PCl_5$ do not obey the octet rule.

Which of the following does not obey the octet rule?

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