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# of neutrons = Mass Number - Number of Protons. To be able to apply this formula, refer to the atomic number and atomic weight of the elements. These two are listed in the Periodic Table of Elements. Take note that atomic number refers to the number of protons in an atom of an element.
Z = atomic number of the atom. n 1 and n 2 are integers where n 2 1. It was later found n 2 and n 1 were related to the principle quantum number or energy quantum number. This formula works very well for transitions between energy levels of a hydrogen atom with only one electron.hen the electron moves from low energy to a higher energy state, a photon of light is absorbed by the atom. Each element has a distinct spectral fingerprint.