Final answer:
The predicted formula for an ionic bond between calcium (Ca) and iodine (I) is CaI2, which ensures charge neutrality by having two iodine ions for every calcium ion.
Step-by-step explanation:
The predicted formula for an ionic bond between calcium (Ca) and iodine (I) would be CaI₂. This is determined by considering the charges on the ions that Ca and I form when they become ions. Calcium typically forms a Ca²⁺ ion, and iodine typically forms an I⁻ ion. To achieve a neutral compound, which is a requirement for the stability of an ionic compound, we need two iodine ions to balance the +2 charge of one calcium ion.