An atom consists of a nucleus at its centre and electrons revolve around it in well defined orbits. Nucleus consists of protons and neutrons. The electrons are negatively charged (1.602×10^-9 coulombs) subatomic particles and having very high insignificant mass (9.108×10^-19 gm) as compared to the mass of protons and neutrons. Protons is a positively charged (1.602×10^-19 coulombs) and has an absolute actual mass of 1.672×10^-24. Neutron posses to electrical charge . Neutron s are present in all atoms expect in hydrogen atom
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