| 21. | The oxidation state of rhenium is + 5 and its configuration is d 2.
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| 22. | Rhenium is most available commercially as salts of perrhenate, including sodium and ammonium perrhenates.
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| 23. | Rhenium tungsten alloys are also applied as thermocouples to measure temperatures up to 2200 �C.
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| 24. | Only the discovery of rhenium was confirmed.
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| 25. | It is the highest chloride of rhenium.
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| 26. | Molybdenum hexafluoride and rhenium hexafluoride are liquids.
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| 27. | Rhenium improves the properties of tungsten.
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| 28. | Rhenium has a high melting point and a low vapor pressure similar to tantalum and tungsten.
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| 29. | Typical materials are a tungsten-rhenium target on a molybdenum core, backed with graphite.
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| 30. | "' Rhenium pentachloride "'is an inorganic compound of chlorine and rhenium.
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