Question

Why is i2 a solid at room temperature while h2 is a gas?

Answer 1

Larger and heavier atoms and molecules exhibit stronger dispersion forces than smaller atoms and molecules.

Step-by-step explanation:

Larger and heavier atoms and molecules exhibit stronger dispersion forces than do smaller and lighter atoms and molecules. F2 and Cl2 are gases at room temperature (reflecting weaker attractive forces); Br2 is a liquid, and I2 is a solid (reflecting stronger attractive forces).