A solid Period 3 element, Q, is allowed to react with oxygen gas, producing compound R. If R is then added to water, the pH falls. What might the empirical formula of R be?
- A$\text{Q}_2\text{O}_4$
- B$\text{Q}_2\text{O}_5$
- C$\text{Q}_4\text{O}_{10}$
- D$\text{Q}_5\text{O}_2$