If an atom contains 12 protons and 10 neutrons, what's its mass number?

asked Mar 21, 2017 74.3k views

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Adding the number of protons and neutrons equals the mass. The answer would be 22.

Mimi Gentz answered Mar 22, 2017

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3 votes

22, because you just add the protons and neutrons (12 + 10)

BrettJ answered Mar 27, 2017

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