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The electron is a subatomic particle with a negative elementary electric charge. The exchange or sharing of the electrons between two or more atoms is the main cause of chemical bonding. British natural philosopher Richard Laming first hypothesized the concept of an indivisible quantity of electric charge to explain the chemical properties of atom in 1838. Irish Physicist George Johnstone Stoney named this charge 'electron' in 1891 and J. J. Thomson and his team of British Physicists identified it as a particle in 1897.