Question

The pair of elements most likely to form an ionic compound are :

• A. iodine and bromine
• B. hydrogen and iodine
• C. potassium and iodine
• D. iron and carbon

Answer 1

Answer: (C)

potassium and iodine

$K$ looses one electron to form monoatomic ion; $K^{+}$ and $I$ gains one electron to form $I^{-}$. Therefore $K^{+}$ and $I^{-}$ ions combine together to form the ionic compound; $KI$