Atomic Models
- Created by: iloverevision:)
- Created on: 02-03-20 12:07
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- Atomic Models
- Dalton
- Solid spheres
- Different spheres = different elements
- Thomson
- Atom must contain even smaller, negatively charged particles
- Plum pudding model
- Rutherford's Model
- Gold Foil Experiment
- Fired alpha particles at v thin sheet of gold
- Expected most to be deflected slightly
- Most passed through gold atoms and very small number deflected backwards
- Came up with nuclear model
- tiny positively charged nucleus surrounded by cloud of negative e-
- Most of atom = empty
- Bohr's Model
- Realised e- in cloud would spiral down into nucleus
- Proposed new model
- electrons only exist in fixed orbits and nowhere in between
- each shell has fixed energy
- when electron moves between shells electromagnetic radiation is emitted or absorbed
- as energy of shells is fixed, radiation will have fixed frequency
- Other Atomic Models
- Refined to include sub-shells
- Not perfect but widely used as its simple and explains many observations
- Most accurate is based on quantum mechanics
- explains some observations that can't be accounted for by refined model but lot harder to get head round and visualise
- Dalton
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