Elemental iodine (i2) is a solid at room temperature. what is the major attractive force that exists among different i2 molecules in the solid?

The appropriate response is "Weak London dispersion forces." 
Iodine exists as a diaatomic particle, I2, which is framed when two iodine iotas shape a covalent bond. 
An essential ramifications of the way that the holding electrons are being share similarly, which is suggested by the covalent holding that exists between the particles, is the way that the iodine atom is nonpolar. 
Therefore, the main intermolecular powers of fascination that exist between iodine atoms are generally feeble London scattering powers. 
The intriguing thing about London scattering powers is that their quality increments with the measure of the atom being referred to, or, as it were, with the extent of the particle's electron cloud. 
More huge atoms have bigger electron mists, something that directly affects the quality of the London scattering powers. 
London dispersion forces emerge when arbitrary instantenous varieties show up in the circulation of a moelcule's electron cloud. These varieties bring forth halfway positive and fractional negative charges on inverse sides of the atom - momentary dipoles. 
Thusly, these incomplete charges can spellbind a neighboring atom by actuating a comparative charge division in that particle's electron cloud.

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It conforms what ever surface its in.