Halogens are present as diatomic molecules, $\text{X}_2$. The boiling points of the Group VII elements rise down the group from chlorine to iodine. Which statement best explains why the boiling point increases as Group VII is descended?
- AThe electronegativity of X decreases as the group is descended.
- BThe number of electrons in each $\text{X}_2$ molecule increases as the group is descended.
- CThe size of the permanent dipole in the $\text{X}_2$ molecule increases as the group is descended.
- DThe X-X bond strength increases as the group is descended.