Question about calcium iodide?

Question

How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide

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Answer 1

2.

This is an ionic bond with the formula of CaI2. Calcium ions have the charge of plus two, which means they lose two electrons. Iodine ions have a charge of minus one, which means that they gain one electron. Since there are two iodine ions, they can accept both of the electrons from the calcium ion.