Discovery of this Atom timeline.

Democritus, a Greek philosopher, also known as the "father of modern science" had the thought and worked on what we know as the atom today back in 370 BC. He traveled across the world, writing as he went, occupying himself with the study of natural philosophy. He believed everything was made up of indestructible, tiny, invisible atoms.

Dalton, an English chemist with a Quaker background, reinforced Democritus's theories and proved the atomic theories being all matter is made up of atoms. Atoms are also indivisible and cannot be manipulated at all. All elements also have atoms that are identical in mass and their properties. Dalton also proved that chemical reactions were just the rearrangement of atoms and that compounds were simply combining of two or more different types of atoms.

Thomson, in the year of 1897, was experimenting and discovered what we know as the electron. He discovered the electron using a cathode ray in which he proved that cathode rays had a negative charge and neon gas had a positive charge. Thomson also improved Daltons theory which was that atoms were tiny invisible particles, when his model demonstrated the atom being composed of electrons which were also surrounded by positive charges to balance the negative charges out.

Rutherford has a very intriguing discovery that involved the ultimate gold foil experiment that showed that all these tiny atoms were actually made up of a charged nucleus that was ultimately orbited by electrons. He proved that the atom actually has a Harvey nucleus even though you can see atoms. The gold foil experiment used the alpha particles emitted from a radioactive element as probes to the unseen world of the atomic structure.

Neil Bohr was the very first person to discover that electrons did not travel together and they orbit around the nucleus like the planets orbit around the sun.1913 was the year he made a shell model of the atom and examined how the electrons can go around the nucleus and also that the side of the electron depends on the size of the whole orbit. He also proved that radiation can only happen if the electron moves from one orbit to another. Neil also won a Nobel prize in 1922.