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4 votes
An atom’s mass number equals the number of

a.
protons plus the number of electrons.
c.
protons.
b.
protons plus the number of neutrons.
d.
neutrons.


Please select the best answer from the choices provided

A
B
C
D

1 Answer

6 votes
An atom's mass number equals the number of protons plus the number of neutrons. 

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