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Julli [10]
3 years ago
15

An atom’s mass number equals the number of

Physics
2 answers:
steposvetlana [31]3 years ago
8 0
An atom's mass number equals the number of protons plus the number of neutrons.
Hope this helps! (:
oksian1 [2.3K]3 years ago
4 0

b.  protons plus the number of neutrons.

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