The chemical formula Ca(OH)₂ represents calcium hydroxide. To determine the number of atoms of each element in this formula:
- Ca indicates there is 1 calcium atom.
- The (OH) indicates there is one hydroxide ion, which contains both oxygen and hydrogen. Since there is a subscript of 2 outside the parentheses, it means there are 2 hydroxide ions.
- Therefore, from the hydroxide ions, there are 2 oxygen atoms (1 from each OH) and 2 hydrogen atoms (1 from each OH).
Putting it all together, Ca(OH)₂ consists of:
- 1 calcium (Ca)
- 2 oxygen (O)
- 2 hydrogen (H)
Thus, the correct answer is: 1 calcium, 2 oxygen, and 2 hydrogen.