Question

The minimum number of electrons having the magnetic quantum number zero for $Ni$ is:

Answer 1

The minimum number of electrons having magnetic quantum number zero for Ni is 13.
The electronic configuration of Ni is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{8}4s^2$.
Except for 3d subshell, remaining each subshell has two electrons; for them, the magnetic quantum number is zero, and 3d-subshell has one electron with magnetic quantum number 0. Hence, a total number of electrons = 13.