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