The electronic configuration of chloride ion is:

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2,8,7

2,8,6

2,8,8

2,8

answer is C.

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Detailed Solution

●        Chlorine has atomic number 17. It has 7 outermost electrons and its valency is 1. Its configuration is 2,8,7.
●        To achieve stability it needs one electron in its outermost shell so on accepting one electron it becomes Chlorine ion.
●        So now it has a total electron 18 and the configuration is 2,8,8.
●        Hence Correct option is 3.

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