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Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped. He discovered his theory around 400B.C.E. He lived and did most of his work in Greece.

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Dalton's atomic theory suggested that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties. He made his discovery in 1803. He was Born in Eaglesfield, United Kingdom

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On his return from America, he achieved the most brilliant work of his life – an original study of cathode rays culminating in the discovery of the electron.He made this discovery in 1897.He was born in Manchester, United Kingdom.

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Ernest Rutherford found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. Ernest rutherford was born in 1871 in New Zealand

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Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. He was born in 1885 in Denmark.

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Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. He was born in 1885 in Denmark.

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Erwin Schrödinger theorized that the behavior of electrons within atoms could be explained by treating them mathematically as matter waves. He was born in 1887 in Austria.