Which of the following electronic configuration is not possible?

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Q 2549267113.     Which of the following electronic configuration is not possible?
BCECE 2015 Mains
A

`1s^2 , 2s^2`

B

`1s^2 , 2s^2 , 2p^6`

C

`[Ar] 3d^(10) , 4s^2 4p^2`

D

`1s^2 , 2s^2 , 2p^2 , 3s^1`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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