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fermion

thumb|upright=1.6|Fermions form one of the two fundamental classes of subatomic particle, the other being [[bosons. All subatomic particles must be one or the other. A composite particle (hadron) may fall into either class depending on its composition.]] In particle physics, a fermion is a subatomic particle that follows Fermi–Dirac statistics. Fermions have a half-integer spin (spin , spin , etc.) and obey the Pauli exclusion principle. These particles include all quarks and leptons and all composite particles made of an odd number of these, such as all baryons and many atoms and nuclei. Ferm

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Fermions are one of two fundamental types of subatomic particles, distinguished by their half-integer spin and their obedience to the Pauli exclusion principle, which prevents multiple fermions from occupying the same quantum state. They include quarks and leptons as well as composite particles made from an odd number of these building blocks, making them essential to the structure of all ordinary matter.

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Commons category: Fermions
spin quantum number: 1

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Elementary fermions{{anchor|elementary_fermion_anchor}}
Composite fermions
See also
Notes
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Some fermions are elementary particles (such as electrons), and some are composite particles (such as protons). For example, according to the spin-statistics theorem in relativistic quantum field theory, particles with integer spin are bosons. In contrast, particles with half-integer spin are fermions.