Aproton is positively (+1) charged particle and the mass 1.6727 x 10-^24 g
a neutron is a neutral (0) particle and the mass is 1.6750 x 10^-24 g

The sub-atomic particles of an atom are the proton, electron and the neutron. An electron has a charge of -1 and a smaller mass than a proton. Proton has the same mass with the neutron. The ratio between the mass of a proton and an electron is about 2000. An electron has an equal value but negative charge with the proton.

b) mutualism

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