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Question

The number of unpaired electron(s) in Mg2+ ion is:

A
zero
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B
one
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C
two
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D
three
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Solution

The correct option is A zero
The electronic configurations are given below:
12Mg:KLM282
12Mg2+:KL28
(noble gas configuration, no unpaired e)
Hence, there are zero unpaired electrons in Mg2+.

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