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Q.

Zeff for last electron of 4S sub shell electron of  Zn atom (Z = 30) is

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a

25.65

b

12.15

c

 8.85

d

4.35

answer is C.

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Detailed Solution

Electronic configuration of Zn 1s22s22p63s23p63d104s2

For 4s sub shell

σ = 0.35 +18(0.85)+10(1)=25.65 

Zeff = 30 -25.65 = 4.35

For 3d sub shell

σ = 9(0.35) + 18(1) = 21.15

Zeff = 30 - 21.15 = 8.85

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