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Hypothesised that no matter how many times you cut a form of matter in half, the result will be smaller. His views of the atomic atom lasted 2000 years
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Often called the father of time.
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All elements are made of atoms and indivisible.
Believed atoms looked lika a ball -
Described atoms by means of formula connected to the frequencies of spectral lines.
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Proposed electric and magnetic fields filled the void
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Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.
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Used the Cathode ray tube to test atoms. Believed atoms were similar to plum pudding
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used the idea of quanta (discrete units of energy) to explain hot glowing matter
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Oil drop experiment determined the charge (e=1.602 x 10 -19 coulomb) and the mass (m = 9.11 x 10 -28 gram) of an electron.
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Had the gold foil experement.
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Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass.
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Believed electrons moved in orbit around the Nucleus.
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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Discovered the neutron
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Greek Era. First to discover the atom. Though his visual was very plain and a basic sphere
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