What is the formula of magnesium fluoride?

A.     \({\text{M}}{{\text{g}}_{\text{2}}}{{\text{F}}_{\text{3}}}\)

B.     \({\text{M}}{{\text{g}}_{\text{2}}}{\text{F}}\)

C.     \({\text{M}}{{\text{g}}_{\text{3}}}{{\text{F}}_{\text{2}}}\)

D.     \({\text{Mg}}{{\text{F}}_{\text{2}}}\)

D