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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. |
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| 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. |
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The electron is a bullet, which explains its capability to pentrate matter.
Physical properties:
| Mass: |
9.109 3826(16) × 10−31 kg |
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1⁄1836.152 672 61(85) amu |
| Electric charge: |
−1.602 176 53(14) × 10−19 C |
| Radius: |
10-18 m |
| Spin: |
½ |
(Source: CERN)
Return to How it works.
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