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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

2

b

0

c

6

d

4

answer is C.

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Detailed Solution

The unpaired electrons are in a gaseous Co3+ ion  in its ground state is 4.

The electronic configuration of the given cobalt ion (Co3+ ion ) is,

1s22s22p63s23p63d74s2

CO273+[Ar]3d44s2

From the following electronic configuration it is obtained that there are in a gaseous Co3+ ion  in its ground state.

Hence, the option C is correct.

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