Q.

Effective nuclear charge by a 3d electron of Fe atom (Z = 26)

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a

4.05

b

23.95

c

19.75

d

6.25

answer is D.

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Detailed Solution

Electronic configuration of Fe=1s22s22p63s23p63d64s24s electrons do not contribute to screeningand 6th electron of 3d is screened by 23 electrons;Z*=Z−σσ=5×0.35+18×1.00=19.75Z*=26−19.75=6.25
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