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There are various basic elements from which all matter is made.
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He believe that all atoms of s given element are identical, elements are made of particles called atoms, and atoms cannot do crested or destroyes
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He started the first version of the law of conservation of mass, recognized, and hydrogen.
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He created the periodic table
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He experiments with cathode-ray tubes led him to confirm the work of earlier scientists by definitively demonstrating the cathode-rays have a negative charge.
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He determined the charge to mass ratio of electrons.
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She discovered radium and polonium, and coined the term radioactivity after studying the decay process of uranium and thorium.
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Published the famous equation E=mc2
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He discovered the concept of radioactive half life.
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He discovered that the number of protons in an element determines its atomic number.
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He proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.
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He proposed that electrons have a wave/particle duality.
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He viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical madel of the atom
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He believed all things were made of matterand essence.
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