Why does iodine posses metallic nature?

Answer 1

Iodine really does not possess much in the way of metallic nature at all. It is very definitely a non-metal. The only characteristic metallic property it possesses is that the solid is a dark grey colour with a somewhat lustrous sheen. It looks a bit like a metal. But that is where the metallic character stops. The solid is very brittle -- not at all plastic or resilient like a metal. It is a very poor conductor of electricity. Its oxides are difficult to form, and they are all acidic rather than basic. The ion that it most readily forms has a single negative charge, like those of chlorine and bromine. Metals only form positively charged ions.

Answer 2

Iodine does not possess metallic nature; it is a nonmetal. It belongs to Group 17 of the Periodic Table, known as the halogens. Iodine exists as diatomic molecules (I2) and exhibits nonmetallic properties such as being brittle and having a low melting point.