Question

when writing the name or formula for an ionic compound, the order they are written is
a nonmetal cation first then metal anion
b nonmetal anion first then metal cation
c metal anion first then non - metal cation
d metal cation first then non - metal anion

Explanation:

To determine the correct order for writing the name or formula of an ionic compound, we recall the basic rules of ionic compounds. Ionic compounds are formed between metals (which typically form cations, positive ions) and non - metals (which typically form anions, negative ions). When writing the formula or name of an ionic compound, the cation (usually from the metal) is written first, followed by the anion (usually from the non - metal).

• Option a is incorrect because non - metals usually form anions, not cations, and metals usually form cations, not anions.
• Option b is incorrect as it reverses the correct order; the anion (from non - metal) should come after the cation (from metal).
• Option c is incorrect because metals form cations (not anions) and non - metals form anions (not cations) in typical ionic compounds.
• Option d follows the rule: metal (which forms a cation) first, then non - metal (which forms an anion).

Answer:

d. metal cation first then non - metal anion