Question

How do scientists determine the number of neutrons in an isotope of an atom?


A.
They find the number of protons.


B.
They divide the atomic mass by two.


C.
They add the number of electrons and protons.


D.
They subtract the atomic number from the atomic mass.

Answer 1

Hints:
Atomic Number = # of protons
Atomic Mass = # of protons + neutrons

Answer 2

your atomic mass is made up of both protons and neutrons. when you add your protons and neutrons you get atomic mass.

Answer 3

use that as a guide