Why don't protons in a nucleus repel each other?
Even if opposite charges repel each other why are all the protons attached at the same place in an atom?
What gives a proton its charge? What is the charge on a proton? Why the atoms become neutral when it shares electron ? Why atoms becomes neutral when it shares electrons? How are the charges of electrons and proton balanced? If opposite charges attract, what stops electrons from crashing into the nucleus? Should they not be attracted to the protons? What is the charge of a proton? What happens when a proton and anti proton annihilate each other at non relativistic speeds? What would come out of this interaction? Are all atoms the same? What happens when a proton and electron collide? If most of the space in an atom is empty,  then why do things collide instead of just passing through each other? Is there a reason that protons are positively charged and electrons are negative? Why doesn't the proton in a hydrogen nucleus pull in its electron? Can a atom of an element and its molecule be the same? An atom that loses one or more electrons will have what kind of charge? What are the best theories at present for the balance in charges of electrons and protons? All atoms of the same element have the same? Negative charged parts of an atom? What is reason for charge on particle? How is the charge of an atom determined? Are all electrons the same? Will atoms in the same orbital have the same energy in all the elements? Why are ions inert? Does orbital energy depend upon effective nuclear charge? How are atoms of the same element alike? Why do electrons in an atom exist in discrete energy levels, and why don’t they fall into the nucleus or radiate electromagnetic energy as they orbit? Do protons and electrons have the same mass? Why neutrons are present in atom? Why atom is neutral? What is the charge of an electron, proton and neutron?