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he thought you could change any metal into gold
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developed the atomic theory about the universe and the theory was anticipated for use in conservation of energy and irreducibility of matter.
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broke atoms down into shapes
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help create a knowledge of physics and astronomy
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his theory was anything that can be broken down into 2 or more parts is not an element
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created law of conservation in mass
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his theory was that atoms were indivisible and indestructible building blocks While all atoms of an element were identical different elements had atoms of differing size and mass.
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Mendeleev found that, when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements
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that the element is determined of the atomic number not atomic weight
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Curie conducted her own experiments on uranium rays and discovered that they remained constant, no matter the condition or form of the uranium. The rays, she theorized, came from the element's atomic structure. This revolutionary idea created the field of atomic physics.
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J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."
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Werner Heisenberg contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle's position and momentum cannot both be known exactly.
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Einstein also in 1905 mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability. Atomic theory says that any liquid is made up of molecules (invisible in 1905). Furthermore, these molecules are always in random, ceaseless motion
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during the 1890s the theory that electricity was conveyed by a miniscule unit, the electron, gained acceptance. By measuring how the various drops of oil moved about, Robert Millikan showed that their charge always was a multiple of a precisely determined charge - the electron's charge.
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Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay. He received the Nobel Prize in Chemistry in 1908.
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In 1913, Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.