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12 Cards in this Set
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- Back
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German physicist who showed that the impact of the cathode ray with a material object created a new ray, which he dubbed the "X-ray"
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Wilhelm Roentgen
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English chemist who offered the experimental evidence for atoms based upon the laws of Conservation of Mass and Constant Composition.
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John Dalton
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German physicist who used discharge tubes to discover cathode-rays and canal-rays, which lead to the discovery of the proton.
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Eugen Goldstein
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English physicist who discovered the electron in 1897 and later determined the charge for the electron.
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J.J. Thompson
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American physicist who determined the charge of an electron by studying the motion of charged oil droplets in an electric field
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Robert Millikan
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English physicist who discovered evidence for an atomic nucleus by firing high-velocity alpha particles at a thin gold foil
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Ernest Rutherford
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English physicist who discovered the neutron after bombarding beryllium-9 with alpha particles and analyzing the radioactive emission.
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James Chadwick
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Austrian physicist that used complex mathematics to express the position and momentum of an electron as a wave of probability
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Erwin Schrodinger
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German scientist that developed the Uncertainty principle describing the impossibility of knowing an electron's position and momentum simultaneously.
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Werner Heisenberg
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German physicist who reasoned that if matter is made up of particles then light energy may also be composed of particles; he named a particle of light a quantum
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Max Planck
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Danish physicist who combined the quantum principle with the emission spectrum of hydrogen gas as evidence that electrons are found only in fixed energy levels.
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Niels Bohr
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Polish scientist, studying and teaching in France, which worked with radioactive materials and later discovered the elements Polonium and Radium
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Marie Curie
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