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daltons model
1803 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 -
JJ thomspon model
1897 Joseph john Thompson
Found that atoms could sometimes eject a far smaller negative particle which he called an ELECTRON. 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 electrons charge like plums surrounded by pudding. -
Ernest Rutherford
Over saw Geiger and Marsden carrying out his famous experiment.
They fired helium nuclei at a piece of gold foil which was only a few atoms thick. -
Niels Bohr
Studied under Rutherford at the Victoria University in Manchester.
Bohr refined Rutherford’s idea by adding that the electrons were in orbits. Rather like planets orbiting the sun. With each orbit only able to contain a set number of electrons -
Democritus
He pounded up materials in his pestle and motar until he had reduced them to smaller and smaller particles which he called them ATOMAS / Greek for indivisible.