Model in which protons are contained in the nucleus, and are surrounded by free-floating electrons: a. bohr model c. quantum mechanical model b. rutherford model d. free-electron model

a. Bohr model c. Quantum mechanical model

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

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