An antiquark quark is a type of particle that is made up of two quarks and an antiquark. A meson is a type of particle composed of one quark and one antiquark, while an ATOM is the smallest unit of matter that can exist independently. A TOP quark is the heaviest of all known quarks, and a gluon is a type of particle that carries the strong force between quarks. Finally, a CHARM quark is a type of quark that has a charge of 2/3.