Question

Which of the following electronic configuration is not possible?
(1)2p3
(2)2d5
(3)4s1
(4)5f8

Answer 1

The required "option (2) $2d^5$ "is not possible.

Explanation:

The electronics configuration are possible:

$1s^2$

$2s^2$    $2p^6$  

$3s^2$    $3p^6$    $3d^{10}$

$4s^2$    $4p^6$    $4d^{10}$  $5f^{14}$  

$5s^2$    $5p^6$    $5d^{10}$  $5f^{14}$  

The electronics configuration $2d^5$ is not possible because $2s^2$    $2p^6$  is possible only.

Thus, the required "option (2) $2d^5$ "is not possible.

Answer 2

Answer:

(2)  2d5

hope it helps u !!