How did Rutherford prove that positively char | vedclass

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(C) Rutherford performed the $\alpha$-particle scattering experiment by bombarding a thin gold foil with high-energy $\alpha$-particles.He observed th

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By observing that some alpha particles bounced back.

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(C) Rutherford performed the $\alpha$-particle scattering experiment by bombarding a thin gold foil with high-energy $\alpha$-particles.He observed that while most $\alpha$-particles passed straight through the foil,a very small fraction was deflected at large angles,and some were even bounced back by $180^{\circ}$.Since $\alpha$-particles are positively charged,their repulsion and deflection by the central part of the atom (the nucleus) indicated that the nucleus contains a concentrated positive charge.

How did Rutherford prove that positively charged particles are present in the nucleus of an atom?

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Write three observations of Rutherford's alpha particles scattering experiment.

In what way is the Rutherford's atomic model different from that of Thomson's atomic model?

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$(a)$ Why did Rutherford choose gold and not any other lighter element (such as aluminium) for his experiment? Explain your answer giving two reasons.
$(b)$ Write the name and symbol of the particle chosen by Rutherford for bombardment against the gold foil in his experiment.

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