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BCE
Democritius develops his laws of an atom stating that atoms are present in the atmosphere. All atoms are individually created. He also said that atoms of a solid are pointy, liquid atoms are round, and oil atoms are very fine. -
John Dalton discoveries that all matter is made up of atoms. All atoms of given elements are identical in mass and properties. Compounds are formed by a combination of two or more atoms. his theory of atomic theory also became the foundation of chemistry.
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J. J Thompson discovered the electron. He also designed expirements for the nature of electric discarge.
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Ernest Rutherford discovers the theory of Radio Activity. He pionnered the understanding of half-lifes and radioactive decay. Through all of his acomplishments he had an element named after him. (Rutherfordium)
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Niels Bhor was the scientist who discovered that electrons travel in stationary orbits that is determined by the angular momentum of the electron.
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Chadwick had discovered the missing part of weight in the atoms. The nuetron. He had also put down the basis for nuclear physics.
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