Question
In 1911 , the physicist Ernest Rutherford discovered that atoms have a tiny, dense nucleus by shooting positively charged particles at a very thin gold foil. A key physical property which led Rutherford to use gold was that it was
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Answer
(b)
In Geiger-Marsden experiment, objective is to target $\alpha$-particles towards an atom. This is possible only when target is a very thin metal foil.
As gold is very malleable, it is possible to produce a foil which is only few atoms thick.
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