Electric charge on an electron is -1.602 10-19C (or experimental value -1.602176634 10-19Coulombs). It is used as a standard unit of charge for subatomic particles. It is called the elementary charge. Symbol of elementary charge is e. The electrical charge on an electron is equal to the charge on proton, but with opposite sign. As the elementary charge is denoted by e, the electron is commonly symbolized by e-. Minus sign denotes negative charge. Charge on an electron is given below in the table in different units.
Subatomic Particle | Electric Charge |
Electron | -1 e |
-1.602 10-19C | |
-4.803 10-10esu |
The intrinsic mass of an electron is approximately 9.109 10-31 kilograms. This mass corresponds to a rest energy of 0.511MeV, according to Einstein’s principle of mass-energy equivalence. We can define its mass in relative terms of proton as well. The mass of an electron is 1/1836 of mass of proton. Mass of electron is given in the table below in different units –
Subatomic Particle | Mass |
Electron | 9.109 10-31 kilograms |
5.486 10-4u or atomic mass units |
As we can see mass of electron is very less so it can be taken as approximately 0amu.
As we have already discussed mass and charge of an electron. So, now its easy to calculate the charge to mass ration of electron.
Charge of an electron (e) = 1.602*10-19C
Mass of an electron (me) = 9.109 *10-31 kilograms
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If we take value up to six digits after decimal, then it will be 1.758820 1011Ckg-1.
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