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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.
which led to a new model of the atom. A model of the gold foil experiment is shown below. (b) For each of the conclusions given below, state which observation from the experiment. provides evidence that: (i) Most of the mass of the atom is concentrated in a tiny region which Rutherford called the. nucleus.