Question

The atomic mass is equal to the _____.

A
number of protons


B
number of neutrons plus protons


C
number of electrons


D
number of protons plus electrons

Answer 1

The atomic mass is equal to the **B** number of neutrons plus protons.

Atomic mass is a weighted average of the masses of an element's isotopes and is primarily determined by the number of protons and neutrons in the nucleus, since electrons have a negligible mass compared to protons and neutrons.