Chemistry, 23.08.2019 23:50 dorothybean

Which statement concerning elements is true? (1) different elements must have different numbers of isotopes.
(2) different elements must have different numbers of neutrons.
(3) all atoms of a given element must have the same mass number.
(4) all atoms of a given element must have the same atomic number.

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Which statement concerning elements is true? (1) different elements must have different numbers of i...