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Q.

The number of d - electrons retained in Fe³⁺ (At.no. of Fe = 26) ion is :

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a

6

b

3

c

4

d

5

answer is C.

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Detailed Solution

The electronic configuration of Fe²⁺ is : $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{6}$

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The number of d - electrons retained in Fe3+ (At.no. of Fe = 26) ion is :