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Q.

The number of p-electrons present in Co2+ ion is

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a

12

b

9

c

6

d

5

answer is A.

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Detailed Solution

Cobalt's electron configuration is [Ar] 3d7 4s2, 

so Co2+ would have an electron configuration of 1s2 2s22p6 3s23p6 3d7 

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