Original: where R _ {infty} is the Rydberg constant, Z is the Atomic number, n is the principal quantum number, h is Planck's constant, and c is the speed of light.
Simplified: where R _ {infty} is the Rydberg constant (typically between 1 eV and 103 eV), Z is the charge of the atoms nucleus, n is the principal quantum number, e is the charge of the electron, h is Plancks constant, and c is the speed of light.