According to Rutherford's model of the atom, where are most of the atom's mass and positive charge concentrated?
In a small, dense nucleus at the center
In Rutherford's alpha-particle scattering experiment, most alpha particles passed straight through a thin gold foil, so most of the atom is empty space.
A few particles were deflected through large angles and a very small number bounced back, showing that the positive charge and almost all the mass are packed in a tiny, dense region — the nucleus at the centre.
Evenly distributed or spread throughout the atom describes Thomson's plum-pudding model, which this experiment disproved.
Electrons, which revolve around the nucleus, carry negative charge and have negligible mass, so the mass and positive charge are not in the electron cloud.
Hence, the answer is In a small, dense nucleus at the center.
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