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Atomic Structure A brief summary.

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1 Atomic Structure A brief summary

2 Models of The Atom The Dalton Model (1810)
Atoms are hard spheres( i.e. marbles or grains of sand) Didn’t explain: how atoms stick together (bonds) how atoms of each element are different

3 Models of The Atom The Plum Pudding Model
Proposed by J.J.Thomson (~1897) Atoms contained negatively-charged particles called corpuscles which were embedded in a sphere of positive charge Atoms were mostly empty space

4 Thomson’s experiment

5 Models of The Atom Rutherford Model (aka: nuclear model) ~1911
The nucleus, which is at the center of the atom, contains protons (positively charged) and all of the atom’s mass Electrons move around the nucleus.

6 Rutherford’s Experiment Alpha particle scattering experiment

7 Rutherford’s experiment
(a) The results that the metal foil experiment would have yielded if the plum pudding model had been correct (b) Actual results

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