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  Greek philosopher, who develop the atom theory.
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  a Greek philosopher that developed the atomic theory of the universe. the theory anticipated the modern principle of the conversation of energy and the irreducibility of matter
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  he made the first example of using theoretical
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  he provided us with the knowledge of natural science.
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  he stressed organization of atoms and is sometimes called the father of chemistry for his extensive work on materials
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  he clarified the concept of the element a simple substances that could not be broken down by any known method
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  he came up with the theory of matter is composed of atoms of differing weights and combined in simple ratios by weight
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  he put the elements in the order that they ae in by there atomic mass
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  he found out that if you take atomic number and add it to a Constance you would get something for the answer.
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  his and his wife theory was that radioactive materials cause atom to brake down spontaneously, releasing radiation in the form of energy and subatomic partials.
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  he was the first to discover the electron.
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  he was known as the creator of the special and general theory of relativity and for his intelligent hypothesis concerning the particle nature of light
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  hes best known for his work in atomic physics and major science. dealing with the fundamental of the universe
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  he became a noble laureate for his pioneering work in nuclear physics and for theory of the structure of the atom
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  he made numerous contributions to our understanding of the atom
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  he contributed to the atom theory formulating quantum mechanics in terms of matrices