Question

# The pair of electrons most likely to form an ionic compound are:A.Iodine and BromineB.Hydrogen and IodineC.Potassium and IodineD.Iron and Carbon

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Hint:
Ionic bonding is a type of chemical bonding in which ionic bonds are formed only between a cation and an anion with sufficient electronegative attraction between them.

-Iodine and bromine both have valence electronic configuration of $np^5$ . This means that both would act as a cation and would only accept electrons while forming an ionic bond. Hence both cannot form an ionic bond with each other.