What is mass number?

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asked Jan 6 in Science by CorrineHampt (2.4k points)

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answered Jan 6 by Dylan31U6281 (2.0k points)

the total number of protons and neutrons in a nucleus

All oxygen atoms have eight protons, and most have eight neutrons as well. What is the mass number of an oxygen isotope that has nine neutrons? What is the name of this isotope?.

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What is mass number?

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