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Why did Rutherford select a gold foil in...

Why did Rutherford select a gold foil in his `alpha`-particle scattering experiment ?

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Gold is highly malleable metal. The gold foll he used was about 1000 atoms thick.
[ The thickness of gold foil was 0.00004 cm. i.e., in l cm thickness the number of gold foil was 25.000]
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