Question

Why does iodine exhibit a slight metallic character?

Answer 1

1. Electronegativity decreases down the halogen group; iodine has lower electronegativity than lighter halogens.
2. Because of this, iodine shows metallic luster unlike other halogens.
3. Iodine can form positive ions like I⁺ and I³⁺ under specific conditions, which is a metallic property.
4. These factors indicate iodine's tendency towards metallic behaviour, though it is still predominantly non-metallic.

This is due to its lower electronegativity and ability to form positive oxidation states.