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

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(C) To determine the group of an element,we write its electronic configuration:$A$ (atomic number $9$): $2, 7$ (Group $17$,Halogens)$B$ (atomic number

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$A$ and $C$

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(C) To determine the group of an element,we write its electronic configuration:$A$ (atomic number $9$): $2, 7$ (Group $17$,Halogens)$B$ (atomic number $11$): $2, 8, 1$ (Group $1$,Alkali metals)$C$ (atomic number $17$): $2, 8, 7$ (Group $17$,Halogens)$D$ (atomic number $12$): $2, 8, 2$ (Group $2$,Alkaline earth metals)$E$ (atomic number $13$): $2, 8, 3$ (Group $13$)Elements belonging to the same group have the same number of valence electrons.$A$ 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 belongs to the same group?

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