The elements A, B, C, D and E have atomic num | vedclass

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(A) To determine if elements belong to the same group,we must write their electronic configurations:$A$ (atomic number $9$): $2, 7$ (Group $17$)$B$ (a

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$A$ and $C$

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(A) To determine if elements belong to the same group,we must write their electronic configurations:$A$ (atomic number $9$): $2, 7$ (Group $17$)$B$ (atomic number $11$): $2, 8, 1$ (Group $1$)$C$ (atomic number $17$): $2, 8, 7$ (Group $17$)$D$ (atomic number $12$): $2, 8, 2$ (Group $2$)$E$ (atomic number $13$): $2, 8, 3$ (Group $13$)Elements with the same number of valence electrons belong to the same group.Here,$A$ and $C$ both have $7$ valence electrons,so they belong to the same group (Group $17$).

The elements $A, B, C, D$ and $E$ have atomic numbers $9, 11, 17, 12$ and $13$ respectively. Which pair of elements belong to the same group?

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