At $298\ \text{K}$, $\Delta_\text{hyd}H$ is $-520\ \text{kJ mol}^{-1}$ for $\text{Li}^+$ and $-322\ \text{kJ mol}^{-1}$ for $\text{K}^+$. Their limiting molar conductivities are $38.7$ and $73.5\ \text{S cm}^2\ \text{mol}^{-1}$. S1: $\text{Li}^+$ holds the most water, so its hydrated radius is largest and its mobility lowest. S2: Stokes' law makes hydrated $\text{K}^+$ about 1.9 times larger than hydrated $\text{Li}^+$. S3: Lithium metal melts highest in the group because $\text{Li}^+$ is most strongly hydrated. S4: $\text{LiCl}$ still colours a flame crimson, because the flame removes the water and gaseous atoms emit. Which statements are correct?