When sodium burns in oxygen, sodium oxide is formed. What balanced equation represents this reaction?
- A$4\text{Na} + 2\text{O} \rightarrow 2\text{Na}_2\text{O}$
- B$4\text{Na} + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}$
- C$2\text{Na}_2 + \text{O}_2 \rightarrow 2\text{Na}_2\text{O}$
- D$2\text{Na}_2 + 2\text{O} \rightarrow 2\text{Na}_2\text{O}$