An ion has $18$ electrons in the outermost shell,it is

The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by

For an electron in a $4d$ orbital,which of the following sets of quantum numbers is not possible?

Explain the meaning of the $+ve$ and $-ve$ signs in the context of the wave function $\psi$ for an electron.

The number of unpaired electrons in an atom with atomic number $29$ is .....

The electronic configuration of three elements $A$,$B$,and $C$ are given below. Stable form of $A$ may be represented by the formula:
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$