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Why did Rutherford select a gold foil in...

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

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Gold is a heavy metal with high mass number. A light metal cannot be used because on being hit by fast moving `alpha-` particles, the atom of light metal will be simply pushed forward and no scattering can occur. Morever, gold is highly malleable and can be beaten to get very thin foils.
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