Question

why proton proton are not repel each other in a nucleus of an atom

Answer 1

Answer:

Protons in nucleus no doubt are repelled by each other. ... The reason for this is that the protons and the neutrons(together called nucleons) are attracted to each other by a strong for called nuclear force. This force acts only in the distances of orders of angstrom or picometre.

Answer 2

Answer:

The strong nuclear force pulls together protons and neutrons in the nucleus. At very small distances only, such as those inside the nucleus, this strong force overcomes the electromagnetic force, and prevents the electrical repulsion of protons from blowing the nucleus apart.

Explanation:

The reason for this is that the protons and the neutrons(together called nucleons) are attracted to each other by a strong for called nuclear force.