The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali…
The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is
spin
azimuthal
magnetic
principal
Solution
Spin quantum number explains the line spectra observed as doublets in case of $\mathrm{H}$ and alkali metals and doublets and triplets in case of alkaline earth metals.