For a given atom, what is the mass number?

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For a given atom, what is the mass number?

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Answer 1 · 2017-03-09T13:56:25

The sum of protons and neutrons is the mass number.

Explanation:

And this sum gives the identity of the isotope.

For the simplest (and most abundant element), hydrogen, MOST hydrogen nuclei are garden variety $protium$ $"protium"$ , $^{1} H$ $""^1H$ . A small proportion of hydrogen atoms are $deuterium$ $"deuterium"$ , $^{2} H$ $""^2H$ . An even smaller proportion of hydrogen atoms are $tritium$ $"tritium"$ , $^{3} H$ $""^3H$ . What is the number of neutrons in each isotope?

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For a given atom, what is the mass number?

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