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Name: James Chadwick
Date: 1932
Discovery: James is the man who discovered the neutron and elementary particles devoid of any electrical charge.

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Name: Ernest Rutherford
Date: 1911
Discovery: Ernest postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.

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Name: Robert Andrews Millikan
Date: 1909
Discovery: Measured the charge of an electron using oil droplets.

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Name: J.J Thomson
Date: 1890s
Discovery: Discovery of electron. Thomson proposed a model of the atom as a sphere of positive matter with electrons positioned based on electrostatic forces.

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Name: Sir William Crookes
Date: 1879
Discovery: Crookes discovered the element thallium and show there is a negative charge in atoms. Also was the one who reconstructed Cathode Ray.

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Name: John Dalton
Date: 1766 - 1844
Discovery: Matter is composed of extremely mall particles called atoms. Indivisible and indestructible.

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Name: Aristotle
Date: 384 - 322 B.C.
Discovery: Aristotle did not believe that empty space could exist. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air.

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Name: Democritus
Date: 460 - 370 B.C.
Discovery: Democritus believes that matter is composed of atoms, which move through empty space.