The history of the atom - page 15 4.5 / 5 based on 2 ratings ? ChemistryAtomsGCSEEdexcel Created by: emj790Created on: 10-01-17 19:06 How did John Dalton describe atoms? (shape) Solid spheres 1 of 16 What did Dalton say the different spheres make up? Different elements 2 of 16 What did J.J. Thomson conclude from his experiments? That atoms weren't solid spheres 3 of 16 How did he find out about electrons? His measurements of charge and mass showed that an atom must contain even smaller, negatively charged particles 4 of 16 What was Thomson's new theory known as? The Plum Pudding Model 5 of 16 Who showed that the plum pudding model was wrong? Rutherford, Geiger and Marsden 6 of 16 What famous experiment did Rutherford conduct? The gold foil experiment 7 of 16 What was the gold foil experiment? They fired positively charged alpha particles at an extremely thin sheet of gold 8 of 16 What were they expecting to happen? The particles to pass straight through the sheet or be slightly deflected 9 of 16 What happened in the experiment? Most of the particles went straight through, some were deflected more than expected, and a small number were deflected backwards 10 of 16 Why did they expect this to happen? They thought that the positive charge was spread out through the atom 11 of 16 What was the theory that Rutherford came up with? The nuclear atom 12 of 16 What is in the nuclear atom? It is mostly empty space but there are electrons spreaded around with a positive nucleus 13 of 16 What did scientists realise about the nuclear atom? That it wouldn't work as the electrons would be attracted to the nucleus, causing the atom to collapse 14 of 16 Who theorised the next atom? Niels Bohr 15 of 16 What is this model called? The Bohr model 16 of 16
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