Question

Determine the number of electrons of manganese which has zero value of the magnetic quantum number.

• A. $1$
• B. $8$
• C. $12$
• D. $13$

Answer 1

Answer: (D)

$13$

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^5$

in each sub energy level, one orbital is with $m=0$

Number of electrons of manganese $(Z=25)$ with magnetic quantum number value $0$ is $13$.

The electronic configuration is as shown.

In 3d subshell, there is only one electron with $m=0$. In all the remaining subshells, each subshell has $2$ electrons with $m=0$.

Hence, the correct option is D.