To find out the number of neutrons in an atom, we need to know the following.
A) atomic number
B) electron number
C) mass number
D) mass and atomic number

Question

Quizplus · Accepted Answer

To find the number of neutrons in an atom, you subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons). Therefore, both the mass and atomic numbers are needed.

To Find Out the Number of Neutrons in an Atom