Research topic: elementary particles (universe)

elementary particles the most basic physical constituents of the universe. Basic Constituents of Matter Molecules are built up from the atom , which is the basic unit of any chemical element . The atom in turn is made from the proton , neutron , and electron . It turns out that protons and neutrons are made of varieties of a still smaller particle called the quark. At this time it appears that the two basic constituents of matter are the lepton (of which the electron is one type) and quark; there are believed to be six types of each. Each type of lepton and quark also... Read more