| 21. | Its uranium and osmium content could have been caused by a nearby supernova.
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| 22. | The compound is used to prepare other osmium complexes.
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| 23. | Osmium is a hard but brittle metal that remains lustrous even at high temperatures.
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| 24. | The hardness of osmium is moderately high at.
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| 25. | Osmium forms compounds with oxidation states ranging from " 2 to + 8.
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| 26. | This could make osmium a potential candidate for a metal-hydride battery electrode.
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| 27. | These species oxidise to osmium ( VIII ) in the presence of such oxidants.
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| 28. | This method involves adding a high concentration of formamide to a osmium tetroxide fixative.
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| 29. | Osmium tetroxide boils at 130 �oxidizing agent.
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| 30. | After only a few years, osmium was replaced by the more stable metal tungsten.
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