How many atoms of each element are in the chemical formula Ca(OH)2?

The subscript 2 outside the parentheses applies to both O and H in the OH group, so there are 2 oxygen atoms and 2 hydrogen atoms. Calcium has no subscript, which means there is 1 calcium atom. The correct choice is 1 calcium, 2 oxygen, and 2 hydrogen.

AI-written and checked against the verified answer.