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50 Cards in this Set

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