a quark ˈkwɔrk or ˈkwɑrk is an elementary particle and a fundamental constituent of matter quarks combine to form composite particles called hadrons the most stable of which are protons and neutrons the components of atomic nucleihe result of two attracting quarks will be color neutrality a quark with color charge ξ plus an antiquark with color charge ξ will result in a color charge of 0 or white color and the formation of a meson this is analogous to the additive color model in basic optics