model of the atom
- Created by: Margaret Hobart
- Created on: 20-04-21 18:07
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- model of the atom
- new evidence leads to new models
- 1. Dalton originally thought atoms were tiny little spheres that couldn't be divided
- electrons were discovered
- 2. J.J.Thompson suggested plum pudding model
- atoms were a ball of positive charge with electrons in it
- 2. J.J.Thompson suggested plum pudding model
- alpha particle scattering experiment
- fired dense + alpha particles at thin gold foil. plum pudding model suggested they would bounce. however some passed through
- 3.Rutherfords nuclear model
- cloud of electrons
- tiny + nucleus in centre
- 3.Rutherfords nuclear model
- fired dense + alpha particles at thin gold foil. plum pudding model suggested they would bounce. however some passed through
- electrons orbit in shells
- 4. Bohr model
- 5. Chadwick discovered neutrons which explained how isotopes had same number protons but different mass numbers
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