Question

what is the correct formula for calcium nitrate?

Explanation:

Step1: Determine the charge of calcium ion

Calcium is in group 2 of the periodic table, so the calcium ion (\(Ca\)) has a charge of \(Ca^{2+}\).

Step2: Determine the charge of nitrate ion

The nitrate ion (\(NO_3\)) has a charge of \(NO_3^-\).

Step3: Use the criss - cross method

To form a neutral compound, the charges must balance. We need 1 \(Ca^{2+}\) and 2 \(NO_3^-\) ions. So the formula is \(Ca(NO_3)_2\).

Answer:

C. \(Ca(NO_3)_2\)