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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. It has one of the highest melting and boiling points of ...
This is a list of the various reported boiling points for the elements, with recommended values to be used elsewhere on Wikipedia. ... 75 Re rhenium; use: 5869 K ...
Melting point In the ... 75 Re rhenium; use: 3459 K: 3186 °C: 5767 °F WEL: ... Boiling points of the elements (data page) List of chemical elements
Spectral lines of rhenium: Other properties; ... Color Phase Melting point Boiling point Sublimation point Density [g/L at s.t.p.] Density [kg/m3 at ...
The free element has the third-highest melting point and highest boiling point of any element. Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper ore's extraction and refinement. Rhenium shows in its compounds a wide variety of oxidation states ranging from −1 to +7.
Rhenium(VII) oxide is the inorganic compound with the formula Re 2 O 7. This yellowish solid is the anhydride of HOReO 3. Perrhenic acid, Re 2 O 7 ·2H 2 O, is closely related to Re 2 O 7. Re 2 O 7 is the raw material for all rhenium compounds, being the volatile fraction obtained upon roasting the host ore. [2]
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
Water boiling at 99.3 °C (210.8 °F) at 215 m (705 ft) elevation. The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid [1] [2] and the liquid changes into a vapor.