History of an Atom Chemistry AQA Single Science
- Created by: MaganjotC
- Created on: 17-04-19 10:51
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- History of the Atom
- John Dalton
- described them as solid spheres
- different spheres made up the different elements
- J J Thomson
- concluded that atoms weren't sold spheres
- measurement of charge and mass showed that an atom had to have electrons
- smaller negatively charged particles
- Ernest Rutherford
- showed that plum pudding was wrong
- alpha particle scattering experiment
- diagram here
- Niels Bohr
- nuclear model explained that electrons were in shells
- electrons orbit nucleus in fixed shells
- solid sphere changed to plum pudding model
- showed the atom as a ball of positive charge with electrons
- John Dalton
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