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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.
Yes, all atoms have a nucleus! The Nucleus is the part of the atom which holds the Protons and Neutrons, the Electrons orbit the atomic nucleus. The atomic nucleus is diffâ¦erent to the nucleus of a cell, which holds genetic information and allows the cell to operate. Answer above provided by Runehally16.