Question

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

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

Answer 1

Answer: (D)

Phosphorus (P) has electronic configuration

$1s^2,2s^2,2p^6,3s^2,3p^3$

Therefore, no valence electron is present in the $3d$-sub shell.

$Fe(III)$ has electronic configuration :

$3d^{5}4s^0$

$Cr(I):3d^{5}4s^0$

$Mn(II):3d^{5}4s^{\circ }$