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If ""(x)^(y)A^(+1) " or " ""(x-1)^(y-2)B...

If `""_(x)^(y)A^(+1) " or " ""_(x-1)^(y-2)B^(+1)` were to be used instead of `alpha` particles in Rutherford's experiment , which would be better and why ?

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The results of Rutherford.s `alpha`-ray scattering experiment are very clear if the deflections are large. As lighter particles show larger deflections, `B^(+1)` would be preferable.
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