World of the Atom... Matching

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  1. Democritus
    Greek atomist

    Thought all things were made up of small, indivisible particles called atoms

    Just a dot
  2. Aristotle
    Rejected Democritus' theory

    Believed all things were infinitely divisible and composed of one substance called Hyle.
  3. Charle Coulomb
    • Laws of attraction and repulsion
    • As distance increases the electrical force decreases

    Showed the relationship between force of charged particles and the distance separating them.
  4. Antoine Lavoisier
    Studied closed systems and chemical reactions.

    Law of conservation of matter (matter can be changed, but cannot be created or destroyed)
  5. Joseph Proust
    Specific substances always contain elements in the same ratio by mass.

    known as law of definite proportions
  6. John Dalton
    Rediscovered the idea of the atom

    • Atoms of different elements were not the same
    • Atoms of one element were exactly alike
    • Atoms can join together to form compounds
  7. Mendaleev
    Developed the periodic table of elements
  8. Henri Becquerel
    Accidentally discovered that uranium ores emit invisible rays that for photographic plates
  9. J.J. Thomson
    • Discovered atoms are divisible
    • Discovered electrons using a cathode ray tube
    • Plum pudding or raisin bread model.
  10. Max Planck
    • Had idea of quanta...
    • Energy is not given off continuously, but in small packets called quanta
  11. Albert Einstein
    Mathematically determined that light was made up of perticles that had discrete energies.

    Called these particles photons
  12. Robert Millikan
    Discovered the numerical charge of the electron
  13. Ernest Rutherford
    Discovered the nucleus

    developed a model that had a positively charged nucleus surrounded by electrons.
  14. Neils Bohr
    Created a model that had a positively charged nucleus surrounded by electrons in defined orbits around said nucleus.
  15. Photon
    Particles with discrete energies that made up light.


    • High energy- purple/violet/blue
    • Low Energy- red
  16. Element
    A type of metter that cannot be chemically broken down
  17. Atom
    The smallest particle of an element that posses the properties of that element
  18. Molecule
    A compound made up of two or more elements
  19. Compound
    Two or more elements combined by chemical bonds.
  20. - charge
  21. 0 AMU (atomic mass units)
  22. 9.8x10^-28
  23. In charge of chemical properties of the atom
  24. Located in CLouds outside of neucleus
  25. equal to the number of Protons
  26. + charge
  27. 1 AMU (atomic mass units)
    Protons & Neutrons
  28. 1.1x10^-24
    Protons & Neutrons
  29. In charge of physical properties of atom
  30. Located inside the neucleus
    Protons & Neutrons
  31. Defines atomic number
  32. Neutral Charge
  33. In charge of stabalizing the neucleus
  34. Found by taking the atomic mass - the atomic #
  35. Louis de Broglie
    Proposed that electrons have the properties of waves
  36. Werner Heisenberg
    • Developed the uncertainty principle
    • It is impossible for us to know simultaneously both the exact location and momentum of the electron in space
  37. Erwin Schrodinger
    incorporated the particle and wave-like behavior of the electron... known as a wave function.
  38. Atomic Mass
    Relative average of the masses of the isotopes of an element
  39. Isotope
    Atoms that have the same number of protons but different numbers of neutrons.
Card Set:
World of the Atom... Matching
2012-02-23 01:11:05

Scientist's models of the atom and matching terms on the test.
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