Quarks are thought to be fundamental particles . There are six different quarks and each one has its own antiparticle.
The other three quarks are Charm, Bottom and Top. It is important to remember that quarks never appear on their own. The energy required to pull two quarks apart is so large that it is enough to make two new particles. A quark and an antiquark are created, another example of pair production. A particle called a neutral pion is made from an up quark and an antiup quark. Moving these apart creates another up quark and an antiup quark. We now have two pairs of quarks. Therefore, trying to separate two quarks results in two more quarks.
Quarks are the smallest building blocks and we can separate all other particles into two groups, those made from quarks and those that aren’t made from quarks. Hadrons – Heavy and made from smaller particles . Leptons – Light and not made from smaller particles