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He expressed that matter was composed of small atoms that could be divided no further. The atoms were all composed of the same primary matter with the weight, size, and shape being the only difference.
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He stated that matter can be neither created nor destroyed in a chemical reaction, and the differences in elements and compounds.
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discovered oxygen
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He disapproved Berthollet with the law of definite proportions. He showed that no intermediate indeterminate compounds existed between them.
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1) matter composed of small atoms 2) all atoms of an element are identical, but different from those of any other element 3) during a chemical reactions atoms are neither created nor destroyed, but rearranged 4) atoms always combine in whole numbers multiples of each other.
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He created the first periodic table then he went on to make predictions about the properties of missing elements.
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He discovered that a sample of uranium was able to expose a photographic plate even when the sample and plate were separated. Exposure of the plate did not depend on the chemical state of cranium and therefore must be due to some property of uranium atom itself.
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Atoms might be composed of even smaller particles and might have a structure that could be analyzed.
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Since atoms were electrically neutral, the atom must also contain a positive charge. An atom was composed of a spherical ball of positive charge imbedded in it.
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He discoverd positive particles and lighter mass and negative particles, radiation emitted from uranium was composed of two elements.
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He introduced the quantim theory.
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They discovered that a large comcentration of charge was located at the center of an atom and became known as the nucleus.
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Mass of an electron was calculated for the first time.
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"There is in the atom a fundamental quantity, which increases by regular steps as we pass from one element to the next", "quantity can only be the charge on the central positive nucleus".
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The theory that electrons travel in discrete orbits around the atoms nucleus.
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He discovered electron waves, only moving particles or objects had an associated wave.
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Example of his EquationSchrodinger equation describes how the quantum state of a physical system changes.
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He identified the neutron.
