4.
A is the set of all electrons, B is the set of all protons and C is the set of all subatomic particles.
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1 amu
The attraction between these unlike charges and the repulsion between like charges is responsible for the chemical properties of atoms. The charge on the proton is +1. The proton has a mass of about 1 amu. In grams, this amounts to roughly 1.66 x 10-24 g, about 1837 times the mass of the electron.
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