Chemistry 0.0 / 5 ? ChemistryAtomsGCSEEdexcel Created by: Melissa2002Created on: 14-01-18 17:46 At the start of the 19th Century, John Dalton described atoms to be what shape? solid spheres 1 of 5 In 1897, why did JJ Thompson conclude this was incorrect? His measurements of charge and mass showed the atom must have a smaller negatively charged particle. 2 of 5 the 'solid sphere' idea was changed; what was the new theory known as? the 'plum pudding model' 3 of 5 Who showed that the 'plum pudding model' was wrong? Rutherford and his students Geiger and Marsden 4 of 5 What was the 'gold foil experiment'? Positively charged alpha particles fired at an extremely thin sheet of gold. 5 of 5
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