Atom

Atomic Theory Scientists

By noahcooley
  • Democritus creates the idea of atoms.
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    Democritus creates the idea of atoms.

    460 BCE - Democritus shares his idea that everything is made up of small, unbreakable things.
  • John Dalton created Atomic Theories.

    John Dalton created Atomic Theories.

    John Dalton created 4 atomic theories about the atom.
  • Crookes discovers cathode rays.

    Crookes discovers cathode rays.

    Sir William Crookes found cathode rays, which are rays emitted from electrons.
  • Thomson discovers the electron.

    Thomson discovers the electron.

    Thomson found the electron and thought that electrons were "swimming" in the proton - known as the plum pudding model.
  • Einstein calculates size of atoms.

    Einstein calculates size of atoms.

    Einstein calculated the size of many atoms and molecules using a formula.
  • Rutherford discovers the nucleus.

    Rutherford discovers the nucleus.

    Rutherford found that there was a nucleus that was surrounded by the electrons,
  • Bohr discovers electron shells; creates model.

    Bohr discovers electron shells; creates model.

    Bohr guessed that electrons have predetermined paths that they constantly travel along. This is a really famous model, known as the Bohr model.
  • Chadwick discovers neutron.

    Chadwick discovers neutron.

    James Chadwick found that the nucleus also contains a neutral charged atom - a neutron.