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discovered that matter is made up of insivisible particles called atoms.
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proposed an atomic theory with spherical solid masses in motion.
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discovered x-rays.
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Wilhelm used x-rays to take a roentgenogram of his wifes hand.
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described the atom as a ball of positive charge containing a number of electrons. -Discovered the electron
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discovered radium and polonium.
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"gold foil" experiment determined that the nucleus of an atom is very dense and has a positive charge. Believed that the electrons were outside the nucleus of the atom.
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explained atomic structure of atom as "successive orbital shells of electrons" called Bohr Planetary Model
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identified electron cloud model as the probable location of moving electrons.
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discovered particles within the nucleus that has a mass similar to a proton. -discovered the proton.
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split the atom.
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bomb was dropped on Japan in WWI
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contained radioactive polonium.