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which electrons distribution in d- -shbs...

which electrons distribution in d- -shbshell is not observrd in any neutral elemet of 3d series ?

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D

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The correct Answer is:
d
in 3d series `3d^(9)` configuation configuration of neutral atom does't exst because in case of Cr.
`""_(24)Cr =4s^(2)3d^(4)`(expected )
But ` ""_(24)Cr =4s^(1) 3d^(5)` ( correct )
and `""_(29)Cu=4s^(2)3d^(9)` ( expected )
but ` ""_(29)Cu =4s^(1)3d^(10)` (correct )
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