However, phosphorus exists in different forms, called allotropes, with varying properties. The most common form is white phosphorus, which is a waxy, highly reactive solid that ignites spontaneously in air.

Here are some of the different forms of phosphorus:

* White phosphorus (P₄): A highly reactive, flammable solid.

* Red phosphorus (P): A less reactive, non-flammable solid.

* Black phosphorus (P): A stable, semiconducting solid.