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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.
Rutherford discovered protons and the nucleus. He showed that atoms have (+) particles in. the center, and are mostly empty space. He called these (+) particles protons. He called the center. of atoms the nucleus.