Consider an element which has more than one proton. Since the protons are of same charge then why don't they repell ? why are they concentrated in that atom?

Question

Answer

Due to  nuclear  force  which  holds   proton to proton  neutron to neutron  and  proton to neutron   together   in  extremely  small  space   in spite   of the  fact  of electrostatic  Froce of  repulsion  of proton to proton

Answer

Protons and neutrons are made up of smaller subatomic particles. When protons or neutrons get close enough to each other, they exchange particles (mesons), binding them together. Once they are bound, it takes considerable energy to break them apart. To add protons or neutrons, the nucleons either have to be moving at high speed or they need to be forced together under great pressure.Although the strong force overcomes electrostatic repulsion, protons do repel each other. For this reason, it's usually easier to add neutrons to an atom than to add protons.

Answer

Meson theory plays a vital role in this case

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