All atoms consist of electrons, which interact with a nucleus consisting of quarks.
In ordinary matter the quarks interact with each other in such a way, that they form the compound bodies neutrons and protons. The interactions between the atomic electrons and the nucleus, as a whole, is the domain of atomic physics while the internal affairs of the nucleus is the domain of nuclear physics. Thus, these two sciences are concerned with the first few steps in the construction of all the material objects we see around us. The leptons and the quarks together constitute the class called fermions. According to the Standard Model all matter is constitued by fermions.