Problem: The mass number of an atom is defined as:  a. The total number of protons, neutrons, and electrons of an atom b. The total number of protons and electrons of an atom c. The total number of protons and neutrons of an atom d. The total number of neutrons and electrons of an atom e. The total number of protons of an atom

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The mass number of an atom is defined as: 

a. The total number of protons, neutrons, and electrons of an atom

b. The total number of protons and electrons of an atom

c. The total number of protons and neutrons of an atom

d. The total number of neutrons and electrons of an atom

e. The total number of protons of an atom