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9 February, 17:29

What is a rule for determining the mass number of an atom or ion?

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  1. 9 February, 19:16
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    The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules ... The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
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