The Atomic Weight of an Element's Atom Equals the Number

Question

The atomic weight of an element's atom equals the number of:
A) electrons and protons.
B) electrons and neutrons.
C) protons and neutrons.
D) protons, electrons, and neutrons.
E) None of these is correct.

Accepted Answer

The atomic weight of an element's atom is determined by the sum of the number of protons and neutrons in its nucleus, as electrons have a negligible mass.