Which statement best accounts for the fact that chlorine, $\text{Cl}_2$, at $40\,^{\circ}\text{C}$ diffuses more slowly than neon, $\text{Ne}$, at $20\,^{\circ}\text{C}$?
- AChlorine has a relative molecular mass of $71$ whilst neon has a relative atomic mass of $20$.
- BChlorine is at a higher temperature than neon.
- CChlorine is diatomic and neon is monatomic.
- DChlorine is more reactive than neon.