The electron was discovered through experiments with A. electricity. B.light. C.radio waves. D.radioactivity.

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The modern periodic law is based on A. atomic number. B. atomic mass. C. atomic weight. D. chemical activity.
Neutral atoms of a given element all have the same A. number of protons. B. atomic number. C. number of electrons. D. All of the above.
Isotopes are atoms of an element with identical chemical properties but with different A. numbers of protons. B. masses. C. numbers of electrons. D. atomic numbers.
Rutherford concluded from his calculations that the volume of an atom A. is filled with protons, neutrons, and electrons. B. is mostly protons, with electrons revolving around the outside. C. is filled with electrons. D.is mostly empty space.
Each family, or group of elements in a vertical column of the periodic table has elements with chemical characteristics that are A. exactly the same. B. similar. C. different. D. exactly opposite.
The idea of matter waves, as reasoned by de Broglie, describes a wavelike behavior of any A. particle, moving or not. B. particle that is moving. C. charged particle that is moving. D. particle that is stationary.
The planetary model of an atom, with the nucleus playing the role of the Sun and the electrons playing the role of planets, is unacceptable because A. the electrical attraction between a proton and an electron is too weak. B. an electron is accelerating and would lose energy. C. the nuclear attraction between a proton and an electron is too strong. D. none of these because the planetary model is acceptable.
The quantum mechanical model of the atom differs from the Bohr model in that it A. considers the electron as a particle. B. considers the electron as a wave. C. predicts the specific location of the electron in an atom. D. states that electrons can only exist at specific distances from the nucleus.
When Rutherford found that some of the alpha particles fired at the gold foil were widely deflected, he concluded that A. gold was an element, not a compound as previously believed. B. atoms are solid, with spaces between them. C. atoms are electrically neutral. D. the positive charge in an atom is concentrated in a tiny nucleus.
The masses of all isotopes are based on a comparison to the mass of a particular isotope of A. hydrogen. B. carbon. C. oxygen. D. uranium.
Niels Bohr"s model of the hydrogen atom A. was controversial because it contradicted accepted principles of physics. B. held that electrons existed in allowed orbits and nowhere else. C. accounted for the observed spectrum in hydrogen. D. All of the above.
The nucleus was discovered through experiments with A. electricity. B. light. C. radio waves. D. radioactivity.
The energy of a photon of light emitted by an electron equals the A. energy of the level it currently occupies. B. energy of the level it just left. C. energy of the ground state of the atom. D. difference in energy between two levels.

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The atomic number of an atom identifies the number of A. protons. B. neutrons. C. quantum orbits. D. excited states.

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