## Chemistry: The Molecular Science (5th Edition)

$Cs^{+}$ and $Se^{2-}$ are likely to be found in an ionic compound
Potassium does not form $K^{2+}$ ion. Cs forms a $Cs^{+}$ ion Aluminum does not form a $al^{4+}$ ion. Florine does not form a $F^{2-}$ ion. Selenium forms a $Se^{2-}$ ion.