What is the electron configuration for a chloride ion?

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What is the electron configuration for a chloride ion?

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Answer 1 · 2015-12-31T11:40:58

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ $1"s"^2 2"s"^2 2"p"^6 3"s"^2 3"p"^6$

OR

$[Ne] 3 s^{2} 3 p^{6}$ $"[Ne]" 3"s"^2 3"p"^6$

Explanation:

The electron configuration of a chlorine atom ( $Cl$ $"Cl"$ ) is as follows:

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$ $1"s"^2 2"s"^2 2"p"^6 3"s"^2 3"p"^5$

But a chlorine ion ( ${Cl}^{-}$ $"Cl"^-$ ) has acquired a $(1)-$ $"(1)-"$ charge as a result of gaining 1 electron. Thus, its electron configuration is:

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ $1"s"^2 2"s"^2 2"p"^6 3"s"^2 3"p"^6$

This may also be expressed as:

$[Ne] 3 s^{2} 3 p^{6}$ $"[Ne]" 3"s"^2 3"p"^6$

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What is the electron configuration for a chloride ion?

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