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By Ryan Kosa

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Often called the "Billiard Ball Model", John Dalton thought that all matter was made up of tiny things called atoms which could not be divided any further. At the time, electrons and the nucleus were unknown and not featured in the model. Dalton first mentioned toward the existence of atoms in a report published in 1805.

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After discovering the electron in 1897, Thomson later released his rendition of the atom in 1904. This version is commonly called the "plum pudding model" due to its similar appearance to a bowl of plum pudding. This model depicted an atom as electron charges that floated in an area of positive charges. Although this model won the Nobel Prize two years later, it still failed to explain the arrangement of electrons in atoms.

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After completing various experiments, Ernest Rutherford released a new model of the atom in 1909, which depicted a tightly packed core with electrons orbiting around, similar to planets in a solar system. There were some issues with this model however, as it failed to address and explain how atoms only emit light at certain wavelengths or frequencies.

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In 1913, Neil Bohr released his model of the atom. It expanded on observations made y Rutherford but also explain how electrons could achieve steady orbits around the nucleus. Bohr stated that electrons could only orbit the nucleus in certain special orbits at different energy levels around the nucleus.