Identify isoelectronic species

1. A.
   ${Br}^{-}$and ${Be}^{2 +}$
2. B.
   ${Cl}^{-}$and ${Li}^{+}$
3. C.
   $S^{2 -}$ and $K^{+}$
4. D.
   $O^{2 -}$ and ${Mg}^{2 +}$

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1. A.
   ${Ba}^{2 +},{Sr}^{2 +},K^{+},{Ca}^{2 +}$
2. B.
   ${Li}^{+},{Na}^{+},{Mg}^{2 +},{Ca}^{2 +}$
3. C.
   $N^{3 -},O^{2 -},F^{-},S^{2 -}$
4. D.
   $K^{+},{Cl}^{-},{Ca}^{2 +},{Sc}^{3 +}$

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