![]() This mass corresponds to a rest energy of 0.511MeV or equivalent to about 8.187×10 -14 joules, according to Einstein’s principle of mass-energy equivalence. Defining it in the relative terms of a proton, it can be found that the mass of an electron is 1/1836 of the mass of a proton. The mass of an electron is presented in the table below in different units – An electron is often considered nearly massless in comparison with a proton or a neutron, and hence the electron mass is not included in calculating the mass number of an atom. ![]() The mass of the electron can be taken as approximately 0 amu because as we can see that it is very less, being almost of negligible value. The electric charge of an electron is -1.602 10 -19 C (or the experimental value -1.602176634 10 -19 Coulombs). Coulomb is considered to be the basic unit of electric charge. It expresses the naturally occurring unit of electric charge and is considered to be a fundamental physical constant.
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