Question

Their are only like charges(protons) in the nucleus of an atom and as we know that like charges repel each other ,so the nucleus should burst but still it is so small. Why?

Answer 1

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》 Because of the strong nuclear force, which is stronger than the electromagnetic force but only acts at extremely short distances. Even then, it’s close. If you put enough protons together, the mutual repulsion can overwhelm the strong force and allow the nucleus to split. This is why atomic fission can occur.All atoms are capable of having neutrons in their nucleus.
atoms grow larger, the presence of neutrons to space out the protons and keep the repulsive charge from rising too high in any one region becomes increasingly important. Dislodging a neutron (say, by showering atoms with neutrons from an external source) can make them unstable, causing them to cleave in two, or to have a higher probability of eventually breaking abort. Very large atoms are often unstable in this way inherently, because there is no way to have enough neutrons to “space out” the strong force enough to stop the repulsion from having at least a change of breaking the nucleus,
Such unstable atoms are called “radioactive” because when taken en masse, a certain percentage of them will undergo fission at any given moment—releasing energy as various forms of radiation. Depending on how unstable they are, this can leave them quite benign (like the atoms of uranium in a kitchen counter top) or fairly dangerous (like those in a spent nuclear reactor core).

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