Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The α form is always obtained when the liquid freezes. However, below -76.9°C, the α form spontaneously converts to the β form:
P4 (s, α) → P4 (s, β)
b. Predict which form of phosphorus has the more ordered crystalline structure (has the smaller positional probability).