OCR Gateway Chemistry the history of atoms
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- Created on: 20-05-13 19:46
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- The History of the Atom
- Dalton
- thought atoms were solid spheres
- disproved by JJ Thomson
- Thomson's measurements of charge and mass showed that atoms must contain electrons
- this is known as the 'plum pudding model'
- Thomson's measurements of charge and mass showed that atoms must contain electrons
- Rutherford
- Rutherford, Geiger and Marsden conducted the gold foil experiment
- they fired positive particles at a sheet of gold
- What was expected: particles deflected
- What happened: most particles passed through
- Most of the particles passed through empty space
- Some were deflected by the nucleus
- Most of the particles passed through empty space
- they fired positive particles at a sheet of gold
- Rutherford, Geiger and Marsden conducted the gold foil experiment
- Bohr
- suggested that atoms have shells
- supported by many experiments
- suggested that atoms have shells
- Dalton
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