...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.
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.
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.
ELECTRON: Float around the nucleus. Are negativly charged.
...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.
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.
NIELS BOHR studied under Rutherford at the Victoria University in Manchester.