Regarding atomic models, which statement is correct?

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1. Regarding atomic models, which statement is correct?

Rutherford’s alpha-particle scattering experiment led to the discovery of the electron

J.J. Thomson suggested that an atom’s nucleus contains protons

An element’s atomic number equals the number of protons in its atom’s nucleus

An atom’s mass number equals the number of electrons in its shells

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Atomic number is, by definition, the count of protons in an atom’s nucleus. The electron was actually discovered by Thomson via cathode rays, and Thomson’s own model had no nucleus concept at all.