For this question, Q stands for an atom of chlorine, bromine or iodine. Which explanation is the correct one for the variation in volatility as you move down Group 17?
- AInstantaneous dipole-induced dipole forces between molecules become stronger.
- BPermanent dipole-permanent dipole forces between molecules become stronger.
- CThe bond energy of the $\text{Q}_2$ molecules decreases.
- DThe first ionisation energy $\text{Q}(g) \rightarrow \text{Q}^+(g) + e^-$ decreases.