Which one among the following has an octet of valence electrons?

Cation

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Inert Gas

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Crystal

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Anion

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Element

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Solution

The correct option is D Inert Gas
Inert gas has an octet of valence electrons.
An octet of valence electrons corresponds to eight valence electrons.
For example, the electronic configuration of neon is $1^{2} 2 s^{2} 2 p^{6}$ . It has eight valence electrons.
Note: Since inert gases have completed their octet, they are stable and chemically inert.

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