Why iodine exist in solid state?

Question

Why iodine exist in solid state?

Answer 1

iodine has a radius Atomic fairly high

then holds with less external force electrons, which are quite distant from the nucleus, which are those involved in the bond with another iodine.

ie electrons outside of the molecule of iodine are not in detention and are therefore highly mobile

accordingly I2 molecule is easily polarizzabile and therefore is able to train with other molecules I2, forces of dispersion of london pretty strong, so that the material I2 is solid at T.room.

Answer 2

As you probably know, and I confirmed on wikipedia, pure Iodine exists as I2 molecules.  Again, as you probably know, I2 is non-polar, but even non-polar molecules exibit something called 'London Dispersion forces', where the electrons in the molecule temporarily become uneven, which then creates an unevenness in surrounding molecules which increases intermolecular attraction.  London Dispersion forces are stronger in larger molecules, and Iodine is rather large.  It's these London Dispersion forces that allow Iodine to exist as a solid.