| Arsenic has two allotropes, yellow arsenic and metallic arsenic, which is brittle. |
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| The plutonium pits of nuclear weapons employ an alloy with gallium to stabilize the allotropes of plutonium. |
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| Two allotropes of the element exist, accounting for the slight variation in densities. |
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| Each of these allotropes of phosphorous also has its own subset of forms. |
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| This qualifier is the general description for the common allotropes of elemental phosphorus. |
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| The presence of these many allotropes makes machining plutonium very difficult, as it changes state very readily. |
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| Among different forms of carbon, graphene is one of the widely studied allotropes. |
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| It is the interaction of the allotropes of iron with the alloying elements, primarily carbon, that gives steel and cast iron their range of unique properties. |
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| The element normally exhibits six allotropes and four oxidation states. |
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| Lead's lighter carbon group congeners form stable or metastable allotropes with the tetrahedrally coordinated and covalently bonded diamond cubic structure. |
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