Atomic history Flashcards
Briefly state Democritus’s contribution to the atomic model.
Proposed the original model of the indivisible atom (atomos)
Who proposed the original model of the indivisible atom?
Democritus
Briefly state Dalton’s contribution to the atomic model.
Proposed the billiard ball model of the atom - no nucleus or electrons
Who proposed the plum pudding model of the atom?
J. J. Thomson
Who discovered the nucleus via the gold foil experiment?
Ernest Rutherford
Who proposed the billiard ball model of the atom?
John Dalton
Who proposed that electrons act as waves around the nucleus in certain orbitals?
Erwin Schrodinger
Briefly state Thomson’s contribution to the atomic model.
Proposed the plum pudding model of the atom - discovery of the electron
Who predicted the wave/particle duality nature of electrons?
Louis DeBroglie
Briefly state Rutherford’s contribution to the atomic model.
Demonstrated that atoms are mostly empty space, discovering the nucleus (gold foil experiment)
Who proposed that matter was quantized?
Max Planck
Briefly state Bohr’s contribution to the atomic model.
Proposed that particulate electrons orbited the nucleus
Briefly state Schrodinger’s contribution to the atomic model.
Proposed that electrons act as waves around the nucleus - can only narrow down the regions (orbitals) where an electron is likely to be found
Who made the discovery of the neutron?
James Chadwick
Briefly state DeBroglie’s contribution to the atomic model.
Predicted the wave/particle duality nature of electrons
Briefly state Bohr’s contribution to the quantum atomic model.
Noted the behaviour of hydrogen atoms and predicted the hydrogen emission spectrum/energy levels of electrons
Briefly state Planck’s contribution to the atomic model.
Proposed that matter was quantized, i.e. that a physical quantity can only have certain discrete quantities (for example, you cannot have a population of 13.5 people)
Who conducted the double slit experiment?
Thomas Young
Briefly explain how the double slit experiment worked and what it showed.
Photons are shot through two slits, creating a wave interference pattern.
If one slit is blocked, photons gather like particles would in one area.
If photons are sent one at a time, with time in between, the wave interference pattern appears.
When trying to determine which photon went through which slit, the wave pattern disappears.
What are two possible theories for the double slit experiment’s results?
- Multiverse theory - photons go certain ways in our universe and different ways in another universe
- A “master wave” controls the path that the photon takes
