Compare the volume of 1.0 g of bromine, Br2, as a solid, liquid, and gas. The density of solid bromine just below the melting point of -7°C is 3.2 g/mL, of liquid bromine at 25°C is 3.1 g/mL, and of gaseous bromine at 25°C is 0.0007 g/mL. What does this indicate about the spacing between molecules in each phase? What is the main structural difference between solid and liquid bromine.