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(350 BC) He believed that all things found on earth were madeat least one of four elements; Earth, Fire, Water, and Air
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(400 BC) He made the atomic theory for the universe.
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Most noted for his discovery in the role oxygen plays in combustion
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Best known for discovering the law of constant composition
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Was the first to suggest the idea of an atom. Created a more accurate Atomic Theory which is still valid today.
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Best known for his contribution to molecular theory which is now known as Avogadro's law
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Discovered Thallium, studied cathode-ray, and fundamental in the development of atomic studies.
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He is credited with being the first to find electrons and the first subatomic particle
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An originator of the quantom theory
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He was the first person to discover radioactivity which is named Becquerel in the periodic table
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Developed the theory of general relativity and worked with quantum mechanics
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His contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number.
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Worked with radioactivity and developed the theory of radioactivity
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He carried out the Geiger–Marsden experiment, which demonstrated the nuclear nature of atoms by deflecting alpha particles passing through a thin gold foil also was the first to discover atoms have a small charged nucleus surrounded by empty space
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He created the Bohr model of an atom and won a nobel prize for his reaserch and understanding of the quantom theory and atomic structure also 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 was honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect
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Created a powerful model of the atom
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Discovered the wave nature of electrons
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Discovered the Neutron and also created an unknown radiation through elements
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He devised a method to formulate quantom mechanics in terms of matrices
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