Rutherford's gold-foil experiments proved the existence of the Nucleus. Hence the correct option is (A).
What was Rutherford's nuclear model of atom ?
The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
Rutherford's atomic model became known as the nuclear model. In the nuclear atom, the protons and neutrons, which comprise nearly all of the mass of the atom, are located in the nucleus at the center of the atom.
The electrons are distributed around the nucleus and occupy most of the volume of the atom.
Therefore, Rutherford's gold-foil experiments proved the existence of the Nucleus. Hence the correct option is (A).
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