The halogen which have the highest melting point over other halogen molecules is iodine (Iā).
Melting point of any substance is that temperature where the substance will changes its state from solid to liquid phase and both state are present in the equilibrium phase.
In the periodic table on moving from top to bottom in a group of halogens, size of the atom increases as a result of which mass and attraction force between molecules is also increases. So required temperature for the melting of the substance is also increases as a result of which melting point of iodine is higher than other halogens.
Hence iodine has the highest melting point.
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