What is the formula of a compound formed between iodine (i) and calcium (ca)?

The chemical formula for the compound will be

Explanation:

Calcium is the 20th element of the periodic table having electronic configuration of

This element will loose 2 electrons and thus shows an oxidation state of +2 units.

Iodine is the 53rd element of the periodic table having electronic configuration of

This element requires 1 electron and thus shows an oxidation state of -1 units.

So, by criss-cross method, the oxidation state of the ions will get exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

Hence, the chemical formula for the compound formed will be

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