| 21. | These are not interchangeable, and the allotropes depend on the environmental pressure.
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| 22. | These metastable allotropes have a trival intrinsic metallic behavior.
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| 23. | It has various allotropes, but only the gray form is important to industry.
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| 24. | The four other allotropes of selenium are metastable.
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| 25. | Neptunium is found in at least three allotropes.
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| 26. | For example, diamond, graphite, and fullerenes are different allotropes of carbon.
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| 27. | Of the several allotropes of plutonium, the metallurgists preferred the malleable ? phase.
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| 28. | Graphite is the most stable allotrope of carbon.
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| 29. | In that sense, allotropes are all homonuclear.
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| 30. | Some elements can occur as more than a single chemical substance ( allotropes ).
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