13. Some of the alpha particles impinged on a metal foil can pass through the foil; this indicates that * A. metals have low density B. there is empty space in the atoms of matter C. there is empty space in the nucleus D. alpha particles are heavy 14. The shell model of the nucleus describes the nucleons in a nucleus to be * A. packed tightly in a tiny space B. located at the center of the nucleus C. distributed in quantum states just like extranuclear electrons D. wave-like 15. A radioactive source consists of 6.4 x 10^11 atoms of a nuclide of a half-life of 2 days. A second source consists of 8.0 x 10^10 atoms of another nuclide of half-life 3 days. After how many days will the number of radioactive atoms in the two sources are equal * A. 6 B. 9 C. 12 D. 18

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Rutherford's scattering experiment

Rutherford’s scattering experiment is also known as the gold foil experiment. This experiment disproved the plum pudding model of J.J. Thomson. In a gold foil experiment, high-energy alpha particles are made to strike a thin gold foil. The scattered alpha particles are detected using a detector. This experiment showed that the positive charge of the atom is at the center. Most of the atom’s mass is also confined to a small volume at the center. This region is known as the nucleus of the atom.