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A proton is a subatomic particle found in the nucleus of every atom.

Atom is a basic building block of matter. with combine atom to form molecule

Atom has proton, electron, and neutron.
Proton is positive electrical charge
Proton has the mass of 1.673 * 10^27 kilogram which is slightly less than mass of neutron
No of proton present in nucleus is called atomic no

What if proton is present outside of nucleus,
The answer is proton acquire fascinating, bizarre, and potentially dangerous properties, similar to those of neutrons.
and that is not good