Question

The mass number of an element is equal to:

a
the number of protons and electrons
b
the number of protons and neutrons
c
the number of electrons
d
the number of protons
Answered by GPT-4o mini
The mass number of an element is equal to:

**b** the number of protons and neutrons.

The mass number is the sum of the protons and neutrons in the nucleus of an atom.