The atom has been suggested as the smallest complete part of matter since the time of the ancient Greek philosophers but they did not have a clear picture of the nature of the atom or any possible structure because of limitations to their scientific knowledge. Dalton was a scientist who suggested in 1810 that the principal feature of atoms is that an element is a pure substance because it contains identical atoms. This was the first time that atoms were regarded as identifiably unique because Dalton also proposed that atoms of different substances were different to each other, particularly…
