Describe how the atomic model was developed by Dalton, Thomson and Rutherford. Success Criteria: Description of Dalton’s, Thomson’s and Rutherford’s atomic.

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Presentation transcript:

Describe how the atomic model was developed by Dalton, Thomson and Rutherford. Success Criteria: Description of Dalton’s, Thomson’s and Rutherford’s atomic models. Description of Rutherford’s ‘Gold Foil’ experiment and what it showed. TAKE 1 MARKS /6 Self assessment: Student comment: Effort Min Max

Record your second draft in the space below: Teacher assessment Teacher feedback: TAKE 2 MARKS /6 ‘Describe how the atomic model was developed by Dalton, Thomson and Rutherford.’ Record your second draft in the space below: Target achieved? Yes Not yet Your target is: Target achieved? Yes

TG Marking guidelines: Dalton: atoms like billiard balls; are smallest particles and cannot be broken up any further. Thomson: Plum-pudding model that states that atoms are made from a positively charged sphere which contains negatively charged electrons like the plums in a plum pudding. Idea stemmed from Cathode ray experiment: rays were made of negatively charged electrons. Rutherford: positively charged alpha particles were fired at a piece of gold foil. Most alpha particles passed straight through the foil, some were refracted, few were reflected. This showed that the atom is made from a tiny positive nucleus orbited by negatively charged electrons. The majority is empty space Viewing only after first attempt. TG