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Atomic charge, isotopes, and the Rutherford model of the atom were discovered in the 1910s, but the neutron wasn't discovered until 1932. So how did people account for atomic mass (e.g., the differing atomic masses of isotopes) in the 1920s?

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Atomic charge, isotopes, and the Rutherford model of the atom were discovered in the 1910s, but the neutron wasn't discovered until 1932. So how did people account for atomic mass (e.g., the differing atomic masses of isotopes) in the 1920s?	40