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Who proposed the idea of the atom as the fundamental unit of matter? a) Isaac Newton b) Albert Einstein c) John Dalton d) Marie Curie
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Which scientist discovered the electron, a subatomic particle? a) Ernest Rutherford b) J.J. Thomson c) Niels Bohr d) Max Planck
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Who proposed the planetary model of the atom, with electrons orbiting around a central nucleus? a) Ernest Rutherford b) J.J. Thomson c) Niels Bohr d) Max Planck
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Which experiment led to the discovery of the nucleus, the dense central part of an atom? a) Cathode ray tube experiment b) Gold foil experiment c) Photoelectric effect experiment d) Double-slit experiment
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Who developed the quantum mechanical model of the atom, which describes electrons as existing in probability clouds rather than fixed orbits? a) Ernest Rutherford b) J.J. Thomson c) Niels Bohr d) Erwin Schrödinger
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