The electron is an elementary subatomic particle that carries a negative electrical charge. The concept of a quantum of
electrical charge had been theorized on several occasions beginning in 1838, including by Irish physicist George
Johnstone Stoney in 1874, who introduced the name electron in 1894. The electron was first identified in 1897 by J.J.
Thomson and his team of British physicists. These charged particles, together with the protons and neutrons that comprise
atomic nuclei, make up atoms. Electron–electron interaction between atoms is the main cause of chemical bonding.
Electrons play an essential role in many physical phenomena such as electricity, magnetism, and thermal conductivity.

Electrons are believed to be point particles with no apparent substructure. They are identical particles that belong to the first
generation of the lepton particle family. Each electron carries a negative elementary charge and participates in
electromagnetic and weak interactions. The components of its spin, or intrinsic angular momentum, can have values of
±ħ⁄2, where ħ is the reduced Planck constant. For this reason electrons are classified as spin-1⁄2 particles. The mass of an
electron is approximately 1⁄1836 of that of the proton.

Source: WikepediA
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