Roughly 2.6 times 10^{-10} meters.
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The diameter of a xenon atom is approximately 0.216 nanometers.
The average diameter of a copper atom is approximately 0.255 nanometers.
An atom with 79 protons in its nucleus is the element gold (Au) on the periodic table.
Rutherford's gold foil experiment showed that atoms have a small, positively charged nucleus at the center, surrounded by mostly empty space where electrons orbit. This disproved the "plum pudding" model of the atom and led to the development of the planetary model of the atom.
Rutherford's gold foil experiment showed that an atom is mostly empty space with a small, dense nucleus at its center. This discovery led to the development of the nuclear model of the atom.