What is the electronic configuration of chloride ion?

1 s^{2} 2 s^{2} 2 p^{2} 3 s^{2} 3 p^{5}

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

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1 s^{2} 2 s^{2} 2 p^{5}

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[A r] 4 s^{2} 4 p^{3}

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Solution

The correct option is B $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$
Chlorine has the atomic number 17. However, chloride ion has 18 electrons. Consequently, it attains the electronic configuration of argon $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$ .
Hence option (b) is correct.

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