Which statement explains why br2 is a liquid at stp and i2 is a solid at stp? (1) molecules of br2 are polar, and molecules of i2 are nonpolar.
(2) molecules of i2 are polar, and molecules of br2 are nonpolar.
(3) molecules of br2 have stronger intermolecular forces than molecules of i2.
(4) molecules of i2 have stronger intermolecular forces than molecules of br2.