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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.
The facts about the atomâs discovery are not easy to explain. John Dalton (late 1700s) was the first to perform experiments that determined atomic weight. But the ancients had already postulated its existence, though they werenât able to prove it.