## BIG IDEA - There are two types of fermions: quarks and leptons. ### Related Topics --- [[Home|Home]] | [[Particle Physics]] | [[Matter]] | [[Structure of the atom]] | [[Notes Vault/Physics Notes Vault/Particle Physics/Fundamental Forces of Nature|Fundamental Forces of Nature]] | [[Hadrons]] | [[Fermions]] | [[Leptons]] | [[Quarks]] | [[Standard Model]]