The atomic theory defines the science behind the composition of matter. A matter is formed from three types of particles, i.e. protons, electrons and neutrons. The first modern description of the atomic concept was given by John Dalton. While writing about John Dalton’s atomic theory, one can’t miss the concept of rearrangement of atoms due to a chemical reaction. Since atoms are the basic concept of chemistry, students often feel overwhelmed to skim through the information and write a well-organized paper. If you are searching for quality guidance, call Treat Assignment Help.