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Q.

The electron configuration of cobalt (Z = 27) is 1s22s22p63s23p63d74s2 . How many unpaired electrons are in a gaseous Co3+ ion in its ground state? 

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a

0

b

2

c

4

d

6

answer is C.

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Detailed Solution

Co3+ : [Ar] 3d

4 unpaired electrons

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