When discussing tungsten tetrabromide (WBr4) and tungsten tetraiodide (WI4), density is a key physical property that reveals how tightly packed the molecules of the two compounds are in a unit volume. Both tungsten tetrabromide and tungsten tetraiodide are compounds of transition metal tungsten and halogens (bromine and iodine), and there are significant differences in density.
First, the density of tungsten tetrabromide is relatively high, about 6.5 to 7.0 g/cm3. This means that in the same volume, the mass of tungsten tetrabromide molecules is larger, and the arrangement of molecules is closer. The high density indicates that the mutual attraction between the molecules is strong, and the molecular arrangement is more compact.
In contrast, tungsten tetraiodide has a relatively low density of about 5.5 to 6.0 g/cm3. This means that in the same volume, the molecular mass of tungsten tetraiodide is lighter, and the arrangement between molecules is relatively loose. A low density may indicate weak mutual attraction between molecules and a looser arrangement of molecules.
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