why iodine is non metal
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Iodine is a non-metallic, dark-gray/purple-black, lustrous, solid element. Iodine is the most electropositive halogen and the least reactive of the halogens even if it can still form compounds with many elements. For many of these uses iodine is turned into iodides
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Lustre is basically due to free electrons. As we move down the group, the size of the atoms increases and more shells are added, so due to screening effect, effective nuclear charge is less and hence electrons are loosely bound. Therefore, iodine is lustrous. ...
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