Mass of electron = 9.11 x 10-31 kg
Mass of proton = 1.67 x 10-27 kg
Mass of neutron = mass of proton
Diameter of nucleus is of the order of 10-14 m
Charge on electron = - 1.602 x 10-19 coulomb
Charge on proton = + 1.602 x 10-19 coulomb.
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