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Democrritius discovered the atom.
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Discovered the rule of oxygen plays in combustion. Recognized and named oxygen in 1778 and hydrogen in 1783. He also helped construct the metric system.
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Helped prove the idea that every pure chemical compund consists of elements ina a definite proportion. Proposed the law of constant composition in 1799.
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Proposed the law of mulitple proportions. This law led ro the atomic theory in 1803. He also developed the concept of the mole and proposed a system of symbols to represent atoms of different elements.
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Declared laws of electrolysis/not praponet of atomism. The laws were: The amount of chemical change or decomposition is exactly proportional to the quantity of electricity that passes in the solution and the amounts of differemt substances deposited or disolved bt the same wuantity of electricity are proportional to their chemical equivalent wights.
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KNown for the discovery of radio activity.
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He identified the negitivly charged electron in 1897.
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Used the idea (discetete units of energy) to explain hot glowing matter. Discovered quantum theory. It revolutionized the understanding of the atomic and subatomic process.
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Proposed the nuclear atom. He also proposed that all of the positive charged and all of the mass of the atom occupied a small volume at the center of the atom. HE also proposed the existence of the 3rd atomic particle, the nuetron.
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Determined the unit charge of ther electron in 1909 thus following the calculation of the mass of the electron and the positivley charged atoms.
e=1.60*10^-19 -
Conducted experiments veryfying that heavy elements capture neutrons and form unstable products which undergo fission. Gave yth first theoretical explanation of fission.
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Recognized that the uranium atom which bombarded by neutrons, actually split. Helped by lisa Meither and Fritz Strassman. Discovered nuclear fusion.
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Discovered the theory of relativity. Published the equation e=mc^2
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Contributed to quantum theory and his research in the structure of atoms. Was the first to discover that electrons travel in separate orbits. Created the atomic model. The element Bh is named after him.
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Well known for the Schrodinger equation. This equation is the wave equation of a non reletivistic quantum mechanics.
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Discovered the nuetron in 1932. His discoverey of the nuetron led to the discovery of fission and ulimatley the atomic bomb.
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Developed the wave mechanics theory.
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They discovered radioactivity.
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Identified six transuranium elements and suggested a change in the layout of the periodic table.
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He discovered that the earth was round. He also believed in the four elements: earth, fire, air, water.
