Atom is composite particles
We base Dalton atomic theory, the atom may be defined as a unit of an element that can enter into chemical reactions. Daltoui had imagined atom as particle extremely small and indivisible. However, a series of studies that began towards the 1850s and expanded in the twentieth century has clearly shown that atoms have internal structure, ie. they are composed of even smaller particles, which are particles called subtomike. These studies led to the discovery of three such particles: elektruneve, protons and neutrons. Therefore, today it is known that the atom was not indivisible particle, but is built of even smaller particles. Each atom is built from the atomic nucleus and electronic envelope. Of the particles that make up the nucleus will only pëmtendim protons and neutrons, which with a common name called nukleone (lat: nukIeus-nucleus). while the electronic envelope consists electrons.
