History of the atom-P1
- Created by: aleena147
- Created on: 30-10-19 00:12
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- 1897- J J Thompson
- The History Of The Atom.
- 1909- Ernest Rutherford
- working with Hans Geiger and Ernest Marsden
- conducted gold foil experiment
- fired positively charged alpha particles at an extremely thin piece of gold
- some passed straight through
- some were deflected backwards
- some deflected slightly
- fired positively charged alpha particles at an extremely thin piece of gold
- Rutherford-
- came up with the theory of nuclear atom
- in his model most of the mass was concentrated in the positively charged nucleus surrounded by a cloud of electrons
- most of the atom is empty space
- Neils Bohr
- scientists realised that electrons in a cloud around the nucleus would cause them to attract causing the atom to collapse
- proposed a model where electrons can only exist in fixed shells or fixed orbits
- 1909- Ernest Rutherford
- figured atoms weren't solid spheres
- measurements of mass and charge showed that the atom must contain smaller negatively charged particles
- made a plum pudding model
- "positive pudding"
- "negative raisins"
- The History Of The Atom.
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