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CaI2 . Calcium has an oxidation number of +2. With Iodine one has a choice between numbers of -1, +1, +5, +7. In order to decide which number to use find which one will be most easy to be the additive inverse (add to zero) of calcium's oxidation number (+2). In this case it is -1. The inverse of 2 is -2. To make -1 equal to -2 multiply by 2. This means that 2 iodine atoms are reuired to react with the one Calcium atom.

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13y ago
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13y ago

Calcium iodide, CaI2

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6y ago

Calcium iodide is CaI2.

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Q: What is the chemical formula for Ca and I?
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