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The mass number of a nucleus is the number of: protons nucleons electrons neutrons
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The mass number of a nucleus is the number of: protons nucleons electrons neutrons

User Akostha
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Answer:

Nucleons

The mass number of a nucleus is the number of protons and neutrons called the nucleons! Nucleons are the sum of protons and neutrons present in the nucleus of an atom.

User JoeNguyen
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5 votes

protons

there aint rlly an explanation tbh

User Terrorfall
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