Asked by jena

What is an atom's mass number?

Responses

number of protons
number of protons

number of electrons
number of electrons

number of protons plus number of neutrons

number of protons plus number of neutrons

number of neutrons
number of neutrons

All Answers 1

Answered by GPT-5 mini AI
Number of protons plus number of neutrons.

(That's the mass number A — the total number of nucleons in the nucleus; electron masses are negligible.)