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He found that mass is conserved in a chemical reaction.
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He was best known for his discovery of the law of constant composition that stated chemical compounds always combine in constant proportions.
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He found that the chemical makeup of air was a mechanical system composed of small individual particles that used pressure applied by each gas independently.
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He discovered electromagnetic induction, the principle behind the electric transformer and generator. This discovery was crucial in allowing electricity to be transformed from a curiosity into a powerful new technology.
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He discovered radioactivity, the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
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He discovered the electron during a series of experiments that were made to study the nature of electric discharge in a high-vacuum cathode-ray tube, which was being investigated by many scientists at that time.
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He originated the Quantum Theory, which is a theory of matter and energy based on quanta, a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.
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She was known for making contributions to the study of radium and radiation was an instrumental technology for the future development of the atomic bomb.
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He created the quantum theory of light, the idea that light exists as tiny packets, or particles, which he called photons. He also proposed that we live in a quantum universe, one built out of tiny, discrete chunks of energy and matter.
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Known for his measurement of the elementary electronic charge and for his work on the photoelectric effect.
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He discovered the nucleus of the atom.
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Discovered that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element.
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His research on quantum theory and for his discovery of wave nature of electrons was a vital part of knowledge of matter during the time period.
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He found the probability that an electron can be found in a given region of space at a given time.
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Discovered the neutron, a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
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Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction.
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He discovered nuclear fission, which is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
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He was known for isolating and identifying transuranium elements, those heavier than uranium. Plutonium and Californium were two.
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