In an atom what particle does the proton repel?

Answer 1

In the nucleus of an atom, the protons repel each other due to their like charges. However, the strong force keeps protons from flying apart, keeping the protons inside the nucleus.

Answer 2

The proton repels other protons and electrons due to its positive charge. Electrons are negatively charged, so they are attracted to the positively charged protons in the nucleus.