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John Dalton was born on September 6, 1766 he died on July 27, 1844 he was born in Eaglesfield, Cumberland and died in Manchester. He observed Pressure and gases. Dalton inferred that there must be tiny particles moving in random motion. He envisioned the atom as sphere. He believed that the atom was the smallest particle of matter. Dalton Also believed that there were no subatomic particles.

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born December 18, 1856,Cheetham Hill died August 30, 1940 Cambridge, Cambridgeshire

English physicist who helped revolutionize the knowledge of atomic structure by his discovery of the electron in 1897.He discovered the electron and isotopes, and invented the mass spectrometer.Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.

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Rutherford–Bohr model.
It was while Bohr was working in England in 1913 that he developed this atomic model. He developed the model after studying the way glowing, hot hydrogen gives off light. ... Bohr suggested that this implies that electrons have to adopt very specific energy levels in an atom, rather than being at any possible level.

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Ernest Rutherford disproved Thomson’s theory of the atom in 1911 when he showed that atoms are mostly composed of empty space. Rutherford discovered this by firing alpha rays - helium nuclei - at a thin sheet of gold foil.If Thomson’s theory were correct, then the alpha rays should pass straight through the gold atoms. Instead, Rutherford found that some of the nuclei were deflected at large angles. A few were even deflected back to where they had come from.

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Chadwick worked with Rutherford, Bohr and Geiger, famous scientists. He worked in physics on studying the atom. In 1932, He detected an unnamed particle, one with the mass similar to the proton, but neutral - he discovered the neutron. He had used an experiment similar to Rutherford, but used a sheet of beryllium and bombarded it with alpha particles.

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Democritus believed that the universe was made up of tiny little orbs, "atoms" (Meaning, indivisible). He believed atoms were solid, hard, incompressible, and indestructible. Aristotle believed that the universe was made up of four elements, Fire, Water, Earth, And Air. His theory was widely excepted as he was better at making things sound believable..

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He identified regions                                                                  around the nucleus where electrons are most likely to be. He called these regions orbitals. He made a equation to solve