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(B) To determine the group,we look at the valence shell configuration:$(i)$ $1s^2 2s^2$: Valence shell is $2s^2$,Group $2$ (Alkaline earth metals).$(i

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$(ii)$ and $(iii)$

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(B) To determine the group,we look at the valence shell configuration:$(i)$ $1s^2 2s^2$: Valence shell is $2s^2$,Group $2$ (Alkaline earth metals).$(ii)$ $1s^2 2s^2 2p^5$: Valence shell is $2s^2 2p^5$,total $7$ valence electrons,Group $17$ (Halogens).$(iii)$ $1s^2 2s^2 2p^6 3s^2 3p^5$: Valence shell is $3s^2 3p^5$,total $7$ valence electrons,Group $17$ (Halogens).$(iv)$ $1s^2 2s^2 2p^6 3d^{10} 4s^1$: Valence shell is $4s^1$,Group $1$ (Alkali metals).Since $(ii)$ and $(iii)$ both have $7$ valence electrons,they belong to the same group,which is Group $17$.

Which of the following elements with the given electronic configurations belong to the same group?
$(i)$ $1s^2 2s^2$
$(ii)$ $1s^2 2s^2 2p^5$
$(iii)$ $1s^2 2s^2 2p^6 3s^2 3p^5$
$(iv)$ $1s^2 2s^2 2p^6 3d^{10} 4s^1$

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Which of the following elements with the given electronic configurations belong to the same group?$(i)$ $1s^2 2s^2$$(ii)$ $1s^2 2s^2 2p^5$$(iii)$ $1s^2 2s^2 2p^6 3s^2 3p^5$$(iv)$ $1s^2 2s^2 2p^6 3d^{10} 4s^1$