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14 Cards in this Set

  • Front
  • Back
Democritus
-Greek
-Called basic particle atom
Dalton
1) Law of Definite Proportion/ Composition
2) Law of Multiple Porportions
3) Law of Partial Pressure

Atom- solid sphere
JJ Thomson
-CRT
-Plum pudding model
-Discovered Electrons
Rutherford
-Alpha Particles (+ charge)
-Alpha Scatter/ Gold Foil Experiment
Atom- not solid, small + dense center (nucleus), negative charges outside nucleus
Moseley
-Ordered atoms based on # of protons
-Used radioactive material to count protons
-Fixed Meneleev's table
Bohr
-Planetary Model
-Electrons in orbit
Mendeleev
-Did not experiment
-Ordered Periodic Table based on atomic weight
-Predicted:
eka-aluminum (Gallium)
eka-silicon (Germanium)
Scandium
Geiger
-"Geiger Counter"
-Measured the amount of radiation
Roentgen
Unit of measurement for radiation
Goldstein
-Discovered Proton
Chadwick
-Discovered Neutron
Millikan
-Oil Drop Experiment
-Charge of Electron was equal to but opposite of proton
-found mass of electron
Marie Curie
Discovered Radiation
Uranium
Polonium
Thorium
Radium
Becquerel
-Discovered Isotopes