Which statement is most useful in explaining why chemists assign atoms to chemical elements by counting protons? A. The proton's negative charge holds electrons in the atom. B. The nucleus doesn't change in stable isotopes. C. Protons at the atom's surface determine the atom's behavior. D. 99% of the atom's mass consists of protons. E. None of these. Elements are defined by the number of protons.
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Home » Physics » Which statement is most useful in explaining why chemists assign atoms to chemical elements by counting protons? A. The proton's negative charge holds electrons in the atom. B. The nucleus doesn't change in stable isotopes. C.