The mass number of an atom is determined primarily by the _______ it contains.

The mass number of an atom is determined primarily by the _______ it contains.

Naim 23:56

The mass number of an atom is determined primarily by the _______ it contains.




a. number of electrons
b. number of protons
c. sum of the number of protons and electrons
d. sum of the number of protons and neutrons
e. number of charges



Answer: D


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