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Mathematics 10 Online
OpenStudy (tennistar):

What determines the mass number of an element? the number of protons the total number of neutrons and protons the number of protons minus the number of electrons the total number of protons, electrons, and neutrons I know this is chemistry, please help me!

OpenStudy (anonymous):

mass is composed of the neutrons and protons (electrons weigh very little)

OpenStudy (tennistar):

so it is B

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