J. J - OCR Gateway - GCSE Chemistry: Combined Science - Question 12 - 2021 - Paper 9
Question 12
J. J. Thomson proposed the 'plum-pudding' model of the atom shown in Fig. 12.1.
Geiger and Marsden worked with Rutherford and tested the 'plum-pudding' model of the... show full transcript
Worked Solution & Example Answer:J. J - OCR Gateway - GCSE Chemistry: Combined Science - Question 12 - 2021 - Paper 9
Step 1
Idea that most alpha particles passed through undeflected showing (the mass is concentrated at the centre of the atom / most of the atom is empty space)
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Answer
Most of the alpha particles passed straight through the gold foil undeflected, indicating that the majority of the atom is empty space.
Step 2
Rutherford proposed that the atom had a positive nucleus
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Answer
Rutherford proposed that the atom contains a small, dense, positively charged nucleus at its center.
Step 3
(Nucleus) is surrounded by electrons
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The nucleus is surrounded by electrons, which occupy the space around it.
Step 4
Idea that (some alpha particles were deflected by large amounts due to positive charges repelling)
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Answer
Some alpha particles were deflected by large amounts due to the repulsion between the positively charged alpha particles and the positive nucleus.
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