Baryons are made of quarks while Leptons are thought to be among the smallest particles, called elementary particles. Baryons have a given Baryon number. In reactions, the Baryon number must be conserved, meaning that both the starting and ending sides of a reaction must have the same number of Baryons. Baryonic particles are made up of a combination of 3 of the six quarks, which are among the smallest particles. The six quark types are up, down (making up protons and neutrons), strange, charm, top, and bottom.