Question

criss cross method/ionic formulas learning che
what is the formula for the compound formed by ca²+ and f^-?
caf
ca2f
caf₂
ca₂f

Explanation:

Step1: Apply criss - cross method

For \(Ca^{2 +}\) and \(F^{-}\), the charge of \(Ca^{2+}\) (\(+ 2\)) becomes the subscript of \(F\), and the charge of \(F^{-}\) (\(-1\)) becomes the subscript of \(Ca\).

Step2: Simplify the formula

We get \(Ca_{1}F_{2}\), and by convention, we omit the subscript \(1\) for \(Ca\).

Answer:

C. \(CaF_{2}\)