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QUESTION

What is the formula for calcium hydroxide?

Calcium hydroxide is formed by one Ca^(2+) cation and two OH^(-) anions, which implies that its chemical formula will be Ca(OH)_2.

Here's how you'd figure this out. If you look at the , you'll see that calcium is in group 2. That means that it has two that it must give up in order to be stable.

On the other hand, oxygen is in group 6, which means it needs 2 electrons in order to be stable. It gets one electron from a hydrogen atom to form an OH^(-) anion. Now it only needs one more electron, which it gets from the two calcium has to offer.

This means that you'd need two OH^(-) groups to form calcium hydroxide, since each OH^(-) group would get one electron from calcium -> Ca(OH)_2.