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What is the mass number of an atom?
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What is the mass number of an atom?

User Aziz Bouaouina
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Answer:

it’s total number of protons and neutrons

User Pho Huynh
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The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.
User Brookemitchell
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