How is the change in electron energy related to the frequency of light emitted in atomic transitions

The light emitted by an electron moving from a higher to a lower energy level has a frequency directly proportional to the energy change in the electron.

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.