The mass of an electron is approximately 0.00054858 atomic mass units (amu).
This value is extremely small compared to the mass of other subatomic particles. For reference, a proton has a mass of about 1.007276 amu, which illustrates just how tiny the electron’s mass truly is. Electrons are fundamental particles, meaning they are not composed of smaller components, and they carry a negative electrical charge. Despite their small mass, electrons play a crucial role in the structure of atoms, as they are involved in chemical bonding and electricity.