7.3 Finding the nucleus — Visual & Photo Quiz

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Look at Ernest Rutherford's gold foil experiment. Why did a very small fraction (1 in 8000) of alpha particles bounce straight back from the gold foil?

They collided head-on with a dense, positively charged nucleus concentrated in the center of the atom

The gold foil was coated in reflective silver paint

The alpha particles were absorbed and immediately re-emitted as light

The electrons in gold atoms attracted and threw the particles back