Question

why are neutrons necessary in the nucleus of the atom?
to keep the electrons away from the protons.
to make the atom heavier.
to serve as a buffer so the protons don’t repel each other.
rewatch

Explanation:

Protons in the nucleus have a positive charge and would repel each other due to electrostatic forces. Neutrons, which are neutral, act as a buffer to hold the nucleus together by contributing to the strong - nuclear force that overcomes the electrostatic repulsion between protons.

Answer:

To serve as a buffer so the protons don't repel each other.