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Q1
The model of the atom changed as new evidence was discovered. The plum pudding model suggested that the atom was a ball of positive charge with electrons embedded in it. Evidence from the alpha particle scattering experiment led to a change in the model of the atom from the plum pudding model.
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(4)
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Most of the alpha particles went straight through the gold foil.
This means most of the atom is empty space.
A few particles bounced back.

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