Atoms

Timeline created by simoneroy
  • 460

    Democritus develops...

    ...the idea of the atom. Democritus pounded up materials in his pestle and mortar until he reduced them to smaller and smaller particles which he called ATOMA.
    Fun Fact:
    ATOMA: Greek for INDIVISIBLE
  • John Dalton suggested...

    ...that all matter was made up of tiny spheres that were able to bounce around with perfect elasticity and called them ATOMS.
    Fun Fact:
    ATOM-Made up of protons, neutrons and electrons.
  • Joesph John Thompson found that...

    ...atoms could sometimes eject a far smaller negative particle which he called an ELECTRON.
    Fun Fact
    ELECTRON: Float around the nucleus. Are negativly charged.
  • Thompson develops...

    ...the idea that an atom was made up of electrons scattered unevenly within an elastic sphere surrounded by a soup of positive charge to balance the electon's charge like PLUM PUDDING.
    Fun Fact:
    PLUM PUDDING MODEL: This idea looks like plums surrounded by pudding.
  • Ernest Rutherford oversaw...

    Geiger and Marsden carrying out their famous experiment. They fired helium nuclei at a piece of gold foil which was only a few atoms thick. They found that although most of them passed through, about one in ten thousand hit.
  • Geiger and Marsden fired...

    fired helium nuclei at a piece of gold foil which was only a few atoms thick. They found that although most of them passed through, about one in ten thousand hit during their famous experiment.
  • Niels Bohr refined...

    ...Rutherford's idea by adding that the electons were in orbits. Rather like planets orbiting the sun. With each orbit only able to contain a set number of electrons.
    Fun Fact:
    NIELS BOHR studied under Rutherford at the Victoria University in Manchester.