What is an electron? State its relative mass and charge.

Electron is negatively charged particles found in the atoms of all the elements. Its relative mass is $\frac{1}{1840}$ of the mass of hydrogen atom. The relative charge of an electron is -1.
Electron is a negatively charged particle that revolves around the nucleus in fixed orbits.

Electrons carry a charge of $-1.602\times {10}^{-19}C$.

Mass is $9.109\times {10}^{-31}Kg$.