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Melting points increase with atomic weight for elemental halogens (the second-most right column in a Periodic Table). The heavier the atom, the harder to turn it into a liquid.
The lightest halogens, such as Florine (F) and Chlorine (Cl) are gasses at room temperature, having "melted" and "boiled" at lower (colder) temperatures.
The two heaviest halogens are Iodine (I) and Astatine (At). Astatine is very rare, but Iodine is common and is a solid at room temperature. The have the highest melting points of halogens.
Remember, F down to At increase in melting points.
F and Cl are gases, so they have low melting point.
Br is a liquid, so it has a higher melting point.
I and At are solids so it takes more heat to melt them.
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