ABSTRACT
In the early 20th century it was believed that all matter consisted of protons, neutrons, electrons and neutrinos. Today, it is accepted that quarks,
Nuclear particles (protons and neutrons) consist of three quarks. A proton i t f t k d d A t i t f t d
electrons and messenger particles responsible for the fundamental forces of nature are the basic building blocks of matter. Quarks and electrons are ordinary particles which contain matter. There are a number of different types of quark:
cons s s o wo up quar s an one own. neu ron cons s s o wo own and one up.
