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Experiments by J.J. Thomson with cathode ray tubes in 1897 led to the discovery of a fundemental building block in matter. Together with the protons and neutrons, the electrons form atoms. J. J. Thomson
Electrons are a type of particles in the lepton class, which are believed to be fundamental particles (impossible to break down into smaller particles). It is believed that the total number of electrons in the known universe is at least 1079. This amounts to an average density of about one electron per cubic metre of space. Electron, like light, do have particle-wave duality. Electron

The electron is a bullet, which explains its capability to pentrate matter.

Physical properties:

Mass: 9.109 3826(16) 10−31 kg 
1⁄1836.152 672 61(85) amu
Electric charge: −1.602 176 53(14) 10−19 C
Radius: 10-18 m
(Source: CERN)

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