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Which electronic distribution in d-subshell is not observed in any neutral element of 3d series?

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a
 
b
 
 
c
 
d
 

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detailed solution

Correct option is D

1n 3d series 3d9 configuration and 3d4configuration of neutral atom doesn't exist because in

case of  Cr. 

 24Cr=4s23d4 (expected)

but  24Cr=4s13d5 (correct)

and  29Cu=4s23d9 (expected)

but  29Cu=4s13d10 (correct) 

Hence, the option D is correct.

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