An electron is a fundamental particle, unlike protons and neutrons which are made up of partial charges known as quarks. Protons are positively charged and electrons are negatively charged while neutrons have zero charge.
Electrons are found in the orbitals, outside the nucleus of an atom which contains the protons and neutrons which are collectively called the neucleons.
( Example - Charge on Electron )
Charges are measured in units called coulombs(C). The charge on one electron is –1.6 x 10–19 coulomb.