The structure of black phosphorus is as follows:
- Atoms are linked together in a puckered sheets like graphite
- The adjacent layers are held 368 pm apart.
- The atoms within a layer are more strongl bound than the atoms in adjacent layers.
- Since it is highly polymeric, it has high density.
- It is the most stable (inactive) form of phosphorus and has a black metallic luster.
- It is a good conductor of heat and electricity.
- It has a sharp m.p. of 860 K.
- Its specific gravity is 2-69.
- It does not burn in air even upto 673 K.