Question

fill in the table below with the elements involved in bond, lewis dot structure, formula, and ratio. 18. what is the correct formula? ca and f

Explanation:

Step1: Determine the charges of ions

Calcium (Ca) is in group 2 of the periodic table. It loses 2 electrons to form \(Ca^{2+}\) ion. Fluorine (F) is in group 17. It gains 1 electron to form \(F^{-}\) ion.

Step2: Use the criss - cross method

For ionic compounds, we use the criss - cross method. The charge of \(Ca^{2+}\) (2) becomes the subscript of \(F\), and the charge of \(F^{-}\) (1) becomes the subscript of \(Ca\). So the formula is \(CaF_{2}\).

Answer:

\(CaF_{2}\)