| 11. | Upon slow cooling, Hittorf's allotrope crystallises out.
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| 12. | Plutonium occurs in a variety of allotropes, even at ambient pressure.
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| 13. | The alpha allotrope is rhombohedral, and the beta allotrope is tetragonal.
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| 14. | The alpha allotrope is rhombohedral, and the beta allotrope is tetragonal.
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| 15. | The red allotrope converts to the red allotrope in the presence of heat.
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| 16. | The red allotrope converts to the red allotrope in the presence of heat.
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| 17. | This multiplicity of allotropes is common among the actinides.
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| 18. | Hittorf's early investigations were on the allotropes of phosphorus and selenium.
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| 19. | The above tendencies can be illustrated on example of different allotropes of phosphorus.
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| 20. | Sulfur has a large number of allotropes, perhaps as many as thirty.
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