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Created with Fabric.js 1.4.5 Atomic theory timeline The Arom The Neutron The Electron Orbit The Four Elements The Electron The Nucleus and the Proton 1932 1913 1909 1897 1807 350 BCE 400 BCE The Billard Ball Model The Greek philosopher Democritus thought of the atom. The smallest piece of existence, which would be uncuttable. The atom would be of many sizes, forever in motion and separated in space. Aristotle, another Greek philosopher believed that everything was made up of four basic elements: fire, water, earth, and air. John Dalton, a scientist, believed Democritus' theory. He had thought that all matter is made up of atoms. That different elements had different atoms and that even though they could never be created or destroyed, during a chemical reaction they could reform into something new. J.J. Thomson discovered the electron while working with hot materials. He theorized that since part of the atom is negative the rest must be positive, this would make the atom neutral. He also theorized that electrons would be evenly spread out. Ernest Rutherford discovered the nucleus while experimenting with Thomson's theory. He found that the atoms centre is full of protons and the over all mass of the atom. Niels Bohr discovered how electrons moved while he experimented with light and prisms. He theorized that electrons orbit the nucleus like planets orbit the sun and that the farther the electron the more energy it gets. James Chadwick, a student of Rutherford, found a neutral part of the atom, he proposed that this neutron would be found in the new lies along with the proton. He also thought electrons circle the nucleus.
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