Question Detail
Question
Which of the following is the correct formula for a compound formed between a cation with a charge of +3 and an anion with a charge of -2?
Correct Answer
Option B is the correct answer.
Detailed Explanation
To balance charges, the total positive charge must equal total negative charge. For a +3 cation and a -2 anion, the least common multiple is 6. This requires two cations (2 x +3 = +6) and three anions (3 x -2 = -6), giving the formula A2B3.
Hint
Find the smallest whole numbers that make the total positive charge equal the total negative charge.