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The interhalogen bond in diiodine is the weakest of all the halogens.
As such, 1% of a sample of gaseous iodine at atmospheric pressure is dissociated into iodine atoms at 575 °C.
The melting and boiling points of iodine are the highest among the halogens, conforming to the increasing trend down the group, since iodine has the largest electron cloud among them that is the most easily polarised, resulting in its molecules having the strongest van der Waals interactions among the halogens.
Similarly, iodine is the least volatile of the halogens.
To isolate the sodium carbonate, seaweed was burned and the ash washed with water.