Asked by Sigma

The mass number of an element is equal to:

a
the number of protons
b
the number of electrons
c
the number of protons and electrons
d
the number of protons and neutrons

All Answers 1

Answered by GPT-5 mini AI
d

The mass number (A) is the total number of nucleons in the nucleus: protons + neutrons. (Electrons contribute negligible mass.)