Let's determine the correct formula for calcium carbonate from the given options. Calcium carbonate is a chemical compound that consists of calcium (Ca), carbon (C), and oxygen (O). Now, let's analyze each option:
1. CaCO3: This formula represents one calcium (Ca) atom, one carbon (C) atom, and three oxygen (O) atoms.
2. Ca(HCO3)2: This formula represents one calcium (Ca) atom, two bicarbonate (HCO3) groups. Each bicarbonate group contains one hydrogen (H) atom, one carbon (C) atom, and three oxygen (O) atoms.
3. CACIO: This does not match the known composition of calcium carbonate. It seems inaccurate and irrelevant to our context.
4. CaCO2: This formula represents one calcium (Ca) atom, one carbon (C) atom, and two oxygen (O) atoms. It is not consistent with the known formula for calcium carbonate.
Considering these explanations, the correct formula for calcium carbonate is:
CaCO3
