Radium is an element that lies beneath barium in Group 2 of the Periodic Table. Which equation represents the change when solid radium nitrate, $\text{Ra(NO}_3)_2$, is heated strongly?
- A$2\text{Ra(NO}_3)_2 (s) \rightarrow 2\text{RaO} (s) + 4\text{NO}_2 (g) + \text{O}_2 (g)$
- B$2\text{Ra(NO}_3)_2 (s) \rightarrow 2\text{RaO} (s) + 2\text{N}_2 (g) + 5\text{O}_2 (g)$
- C$\text{Ra(NO}_3)_2 (s) \rightarrow \text{RaO} (s) + \text{N}_2\text{O} (g) + 2\text{O}_2 (g)$
- D$4\text{Ra(NO}_3)_2 (s) \rightarrow 2\text{Ra}_2\text{O} (s) + 8\text{NO}_2 (g) + 3\text{O}_2 (g)$