Final answer:
The nonmetal that will form an ionic compound with (Sc ³⁺) in a 1:1 ratio of cations to anions is F (fluorine).
Step-by-step explanation:
The nonmetal that will form an ionic compound with (Sc ³⁺) in a 1:1 ratio of cations to anions is F (fluorine).
In an ionic compound, the cation (Sc³⁺) and anion combine to form a neutral compound. Since (Sc ³⁺) has a charge of +3, it needs three negatively charged ions to balance out its charge. Fluorine (F) has a charge of -1, so three fluorine ions (F⁻) would combine with one (Sc³⁺) ion to form the compound ScF₃.
Therefore, the correct answer is (b) F.