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According to Democritus’ atomic theory,everything is composed of atoms, between atoms is empty, and atoms are indestructible
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He proposed the Combustion Theory which was based on sound mass measurements. He named oxygen. He also proposed the Law of Conversation of Mass which represents the beginning of modern chemistry.
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He made one of the most significant discoveries that led to the idea that atoms had an electrical component.
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He developed the developed the concept of the mole and proposed a system of symbols to represent atoms of different elements.
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He proposed the the Law of Constant Composition in 1799
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They contributed to the study radium and radiation
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He discovered the electron by experimenting with a Crookes
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He postulated the nuclear structure of the atom
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He proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities
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He discovering the value for electron charge, e, through the famous oil drop experiment
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He used mathematical equations to describe the likelihood of finding an electron in a certain position.
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He discovered the neutron in atoms