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The number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.he number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.
Discovery of the Proton Ernest Rutherford discovered the existence of the proton in 1918 through an experiment that sent alpha particles through nitrogen gas. Importance of the Proton The proton is important because the number of protons in the nucleus of an atom determines which chemical element the atom is.