The mass number of an atom is equal to ______. • the sum of electrons plus neutrons in the atom • the number of protons, neutrons, and electrons in an atom • the sum of the protons plus neutrons in the

The mass number of an atom is equal to ______.

• the sum of electrons plus neutrons in the atom

• the number of protons, neutrons, and electrons in an atom

• the sum of the protons plus neutrons in the atom

• the number of electrons times the mass of an electron

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The mass number of an atom is equal to ______. • the sum of electrons plus neutrons in the atom • the number of protons, neutrons, and electrons in an atom • the sum of the prot…

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