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

The quantum number which explains the line spectra observed as doublets in the case of hydrogen and alkali metals, and doublets and triplets in the case of alkaline earth metals is:

Choose the correct alternatives. The number of unpaired electrons in an atom of:

The shape of $p$-orbital is

Number of unpaired electrons in $Fe^{+3}$ $(Z = 26)$ is

Which of the following represents the electronic configuration of an element with atomic number $17$?