Answer:
B) NaF
Step-by-step explanation:
Firstly, a binary compound consists of two ions of different elements. Unlike covalent bonding, ionic bonds consist of ions with opposite (negative and positive) charges.
Sodium Fluoride is an inorganic compound made up of sodium and fluorine. Sodium (metal) acts as the cation, while fluorine (nonmetal) acts as the anion. Thus, all knowing, Sodium Fluoride (NaF) is a binary ionic compound.