The Rydberg-Balmer equation is a mathematical formula used to predict the wavelength of light resulting from the movement of an electron between energy levels in an atom. The transition results in the emission of a photon of frequency ν and energy hν:
hcλ = ​​​​​2.1799 x 10-18 1nf2 - 1ni2
The Rydberg equation only works for hydrogen and species with one electron