Question

Which of the following does not have valence electron in $3d$ - subshell?

• A. $Fe\left(III\right)$
• B. $Cr\left(I\right)$
• C. $Mn\left(II\right)$
• D. $P\left(0\right)$

Answer 1

The correct option is D $P\left(0\right)$

$P\left(0\right)$: Phosphorus is not a d- block element. It is an element from p-block (15 group or Nitrogen group), thus, can not have any valance electron in d subshell.

All other elements are d-block elements therefore has valance electron in 3d subshell.
Electronic configuration of $Cr\left(I\right)$ is

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^5$.
Electronic configuration of $Fe\left(III\right)$ is
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^5$.
Electronic configuration of $Mn\left(II\right)$ is
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^5$.
So, all these have valence electrons in $3d-subshell$. So, option (d) is correct answer.