The mass of an atom is largely determined by the number of ________ it has.
A)electrons
B)protons
C)neutrons
D)protons + neutrons
E)protons + electrons

Question

Quizplus · Accepted Answer

The mass of an atom is determined by the sum of the number of protons and neutrons in its nucleus. Electrons have negligible mass compared to protons and neutrons and therefore do not significantly contribute to the mass of an atom.

The Mass of an Atom Is Largely Determined by the Number