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| 624BC. Greece. "atomos" indivisible 4 elements-earth, fire, water, air |
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| 1803. England. Produced modern theory of atom solid mass |
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| 1897. England. Contribution discovered electron. Model of atomis big circle with electrons in it. Cathode ray tube for his experiment. |
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| 1908. Canada. Found nucleus and concluded that most mass was there. |
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| 1930's. Japan. The electrons around nucleus. (supported the theory) |
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| 1910. America(illinois). He found charge in electrons. Oil drop experiment. Found idea of the mass charge of 1.59x10-13 |
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| 1914. England. Found protons in nucleus and atomic number. Compared masses of elements. Did all work in 4 months. Died by getting shot in the dead |
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| After WWI-1919. Egnland. The discovery of isotopes whole number rule. Isotopes are atoms that have missing or too much neutrons. |
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| Mid 1922. Denmark. Has electrons on a different ring of orbit. |
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| 1921. France. Particles when they move they travel in wave lengths. The electrons are the particles. They are particles with energy. |
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