MCQ
Which of the following does not have valence electron in $3d-$ subshell
- A$Fe (III)$
- B$Mn (II)$
- C$Cr (I)$
- ✓$P (0)$
✓
Answer
Correct option: D.
$P (0)$
d
$P (0)$ : 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.
$P (0)$ : 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 $3 d$ subshell.
Electronic configuration of $Cr ( I )$ is $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5$.
Electronic configuration of $F (III)$ is $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5$
Electronic configuration of $Mn (II)$ is $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5$.
So, all these have valence electrons in $3 d$ - subshell.
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