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Alpha-particles are projectied towards t...

Alpha-particles are projectied towards the nuclei of the following metals with the same kinetic energy. Towards which metal, the distance of closest approach is minimum?

A

`Zn(z = 30)`

B

`Cd(Z = 48)`

C

`Hg(Z = 80)`

D

`Al(Z = 13)`

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The correct Answer is:
D
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