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What is a proton?


Proton is a subatomic particle of an atom having a unit positive charge (1.602x10-19 coulombs) and a mass (1.67x 10-27 kg) which is practically the same as that of a hydrogen atom.
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What is an Electron?


Who discovered neutron?


What is a neutron?

What is the name of the remaining part of atom except outer orbit?


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