Na reacts with element X to form an ionic compound with the formula Na₃X. Ca will react with X to form . A) Ca₃X B) CaX₂ C) Ca₂X₃ D) Ca₃X₂ E) CaX

Question

Quizplus · Accepted Answer

Since Na reacts with X to form Na₃X, we know that X has a valency of 1. Ca, which has a valency of 2, will need two X ions to form a neutral compound. Therefore, the correct formula for the compound formed between Ca and X would be Ca₃X₂, which simplifies to Ca₃X₂. The only choice that matches this formula is D. The other options either have the wrong ratio of Ca:X or include extra sulfur ions that aren't required to balance the charges.

Na Reacts with Element X to Form an Ionic Compound