The mass number represents the number of
A) protons in an atom.
B) electrons in an ion.
C) neutrons in an atom.
D) protons and neutrons.
E) neutrons and electrons.

Question

Quizplus · Accepted Answer

The mass number represents the total number of protons and neutrons in an atom. The number of electrons in an atom can vary, while the number of protons and neutrons determines the identity of the element.

The Mass Number Represents the Number of