Which Of The Following Is Not True For The Atoms 13N, 14N, And 15N?

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Which Of The Following Is Not True For The Atoms 13N, 14N, And 15N?

a. They all have the same mass number. b. They are isotopes. c. They all have the same atomic number. d. They all have 7 protons. e. They all have 7 electrons.
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They all have the same mass number.

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