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50 Cards in this Set
- Front
- Back
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developed a periodic table based on atomic weights
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Dmitri Mendeleev
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determined the charge and the mass of an electron
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Robert Millikan
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built the mass spectrometer
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Francis Aston
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identified alpha radiation
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Ernest Rutherford
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determined the existence of the nucleus with the Gold Foil experiment
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Ernest Rutherford
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determined the charge to mass ratio of an electron
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J.J. Thomson
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studied the types of light given off by the hydrogen atom
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Balmer, Lyman, Paschen
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published the first formal Atomic Theory
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John Dalton
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proved that cathode rays were really negative particles
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Jean Perrin
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came up with Quantum Mechanics
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Werner Heinsenberg
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gave us the modern definition of an element and the Law of Conservation of Mass
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Antoine Lavoisier
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proposed the existence of "elements"; but did not believe in atoms
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Aristotle
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discovered the new elements Radium and Polonium
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Marie Curie
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determined the atomic number of the known elements
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Henry Moseley
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discovered the cathode rays after he built the cathode ray tube
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William Crookes
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discovered the existence of X-rays
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Wilhelm Rontgen
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given credit for discovering the proton
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J.J. Thomson
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determined the atomic numbers of the known elements
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Henry Moseley
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determined the Law of Definite Composition
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Joseph Proust
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determined the wave nature of very small and very fast particles; like electrons
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Louis de Broglie
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identified beta radiation
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Ernest Rutherford
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won a Nobel Prize for discovering artificial radioactivity; but narrowly missed two other significant discoveries
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Irene Curie
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identified gamma radiation
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Paul Villard
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first woman to win a Nobel Prize and she won two!
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Marie Curie
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organized the theory of quarks with "flavors" and "colors"
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Murray Gell-Mann
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discovered radioactivity and that radioactivity consists of three types
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Henri Becquerel
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determined that the atom contained seven electron shells or energy levels
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Niels Bohr
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known as the Father of Modern Chemistry and developed a more quantitative approach to experiment
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Antoine Lavoisier
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came up with the idea of "photons" and the Photo-Electric Effect
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Albert Einstein
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came up with Wave Mechanics
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Irwin Schrodinger
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came up with the Uncertainty Principle
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Werner Heisenberg
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determined the atomic weights of the known elements
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John Dalton
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determined the formula for the energy of an electromagnetic wave
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Max Planck
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proposed the existnece of "atoms"
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Democritus & Leucippus
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given credit for discovering the electron
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J.J. Thomson
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promoted the natural science of experimentation that became the Scientific Method
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Roger Bacon
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pioneered techniques for working with radioactive samples
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Marie Curie
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given credit for discovering the neutron
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James Chadwick
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determined that energy really exists in small, definite, discrete amounts called "quanta"
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Max Planck
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determined that isotopes exist
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Francis Aston
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came up with the Uncertainty Principle
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Werner Heisenberg
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determined the atomic weights of the known elements
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John Dalton
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determined the formula for the energy of an electromagnetic wave
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Max Planck
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proposed the existnece of "atoms"
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Democritus & Leucippus
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given credit for discovering the electron
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J.J. Thomson
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promoted the natural science of experimentation that became the Scientific Method
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Roger Bacon
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pioneered techniques for working with radioactive samples
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Marie Curie
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given credit for discovering the neutron
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James Chadwick
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determined that energy really exists in small, definite, discrete amounts called "quanta"
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Max Planck
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determined that isotopes exist
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Francis Aston
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