| This qualifier is the general description for the common allotropes of elemental phosphorus. |
| Among different forms of carbon, graphene is one of the widely studied allotropes. |
| The element normally exhibits six allotropes and four oxidation states. |
| Each of these allotropes of phosphorous also has its own subset of forms. |
| The plutonium pits of nuclear weapons employ an alloy with gallium to stabilize the allotropes of plutonium. |
| The presence of these many allotropes makes machining plutonium very difficult, as it changes state very readily. |
