Question

If same charge repel each other how come protons stay together in nucleus.

Answer 1

same charges repel each other

protons and neutrons are in the nucleus and electrons are revolving around the nucleus in various shells... the electrons are negative while protons are positives. they get cancelled out..
no of protons=no of electrons

so the change of the nucleus becomes neutral

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Answer 2

An atom contains protons, neutrons, and electrons. The nucleus of an atom consists of bound protons and neutrons (nucleons). The negatively-charged electrons are attracted to the positively-charged protons and fall around the nucleus, much like a satellite attracted to the gravity of the Earth. The positively-charged protons repel each other and aren't electrically attracted or repelled to the neutral neutrons, so you may wonder how the atomic nucleus sticks together and why protons don't fly off.

The reason protons and neutrons stick together is because of the strong force. The strong force is also known as the strong interaction, color force, or strong nuclear force. The strong force is much more powerful than the electrical repulsion between protons, but the particles have to be close to each other for it to stick them together.


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