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End of Chapter Key Questions

End of Chapter Key Questions - End of Chapter Key Questions...

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End of Chapter Key Questions Chapter 9 1. What was the Greek model of the atom? Why was it final rejected? - The Greek model of the atom said that the atom was a tiny, solid, indivisible, indestructible object. It was rejected when it was discovered that atom’s emit light and JJ Thomson’s discovery of the electron. 2. What two models were proposed to replace the Greek model? Can you describe each one? - The planetary model and the Plum Pudding model. The planetary model had negative electrons orbiting the positive nucleus. The plum pudding model is negative electrons embedded in a positive pudding-like material. 3. Why was one of them initially selected over the other? - The Plum pudding model was initially selected over the planetary model because in the planetary model, the charges were always accelerating. This means that light was always being emitted. 4. What was one difficulty the Plum Pudding model had from the start? -The pudding would damp out the motion of the electrons quite rapidly.
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