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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.
How did Rutherford's experimental evidence lead to the development of a new atomic model? Rutherfords gold foil experiment demonstrated the existence of the nucleus and lead to the model of a positive nucleus surrounded by electrons.