فرمیون

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