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Quarks are fundamental particles which have never been identified in isolation, and are only found as hadrons, held together by the strong force.

There are 6 types of quark: up, down, strange, charm, top, and bottom.

All quarks have a corresponding antiparticle, called an antiquark.

Quarks possess various properties, including having masses, charges, spins and under both strong and weak interactions[1].



Quarks have fractional charges, -1/3 or 2/3, depending on the type. Down, strange and bottom type quarks have -1/3e charges, making them down-type quarks, whereas up, top and charm quarks have 2/3e charges, making them up-type quarks. Baryons (qqq) or mesons (qq-), are composed so that each combination of quarks in a baryon form a integer, but combinations of quarks in mesons leads to integer charges. Baryons can be made with many combinations of different quarks, whereas mesons are made of a particular quark and it's constituent antiquark. Antibaryons can also be formed, using three antiquarks[2][3].


  1. http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/quark.html
  2. http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/quark.html
  3. Lincoln D. Scientific American. The inner life of quarks.2014.[Cited 6/12/17].Available from https://www.scientificamerican.com/article/the-inner-life-of-quarks-extreme-physics-special/
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