text: bond sodium and iodine. show all steps. this bond is covalent/ionic. finish the folling  i know this because..   electronegativity values are a good indication although there is a huge grey area with defining the type of bonding this way... li = 1.0, i = 2.5  the greater the difference, the more ionic the bond, the 1.5 difference here is a sign this is definitely on the ionic side.