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The quantum number$n_{\mathrm{i}}$that identifies the higher energy level from which the electron falls into a lower energy level.

The quantum number$n_{\mathrm{f}}$that identifies the lower energy level into which the electron falls from a higher energy level.

The ratio$\raisebox{1ex}{$n_{\mathrm{f}}$}\!\left/ \!\raisebox{-1ex}{$n_{\mathrm{i}}$}\right.$, where$n_{\mathrm{f}}$is the quantum number that identifies the lower energy level into which the electron falls and$n_{\mathrm{i}}$is the quantum number that identifies the higher level from which the electron falls.

The sum$n_{\mathrm{f}}+n_{\mathrm{i}}$of two quantum numbers, where$n_{\mathrm{f}}$identifies the lower energy level into which the electron falls and$n_{\mathrm{i}}$identifies the higher level from which the electron falls.