Which equation shows the first ionisation energy of iodine?
- A$\tfrac{1}{2}\,\text{I}_2(g) + e^- \rightarrow \text{I}^-(g)$
- B$\text{I}(g) + e^- \rightarrow \text{I}^-(g)$
- C$\tfrac{1}{2}\,\text{I}_2(g) \rightarrow \text{I}^+(g) + e^-$
- D$\text{I}(g) \rightarrow \text{I}^+(g) + e^-$