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(A) Rutherford's model of the atom proposed that:$(i)$ The positive charge and most of the mass of the atom are concentrated in a small central region

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$(i)$ and $(iii)$

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(A) Rutherford's model of the atom proposed that:$(i)$ The positive charge and most of the mass of the atom are concentrated in a small central region called the nucleus.$(ii)$ $\alpha$-particles are helium nuclei $(He^{2+})$,which have a mass of $4 \ u$,making them four times as heavy as a hydrogen atom $(1 \ u)$.$(iii)$ Electrons revolve around the nucleus in circular paths,similar to how planets revolve around the Sun,hence it is often compared to the solar system.$(iv)$ It contradicted Thomson's model,as Thomson's model suggested a uniform distribution of positive charge,whereas Rutherford's model proposed a concentrated nucleus.Therefore,statements $(i)$,$(ii)$,and $(iii)$ are correct. Since the option $(i)$ and $(iii)$ is provided as the best fit among the choices,the correct answer is $A$.

Which of the following statements about Rutherford's model of the atom are correct?

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