A very hard, silver-white transition
element in group VIIB of the periodic
table, first discovered in 1925. It is heavy, very rare, and found in molybdenite and platinum ores from which it is obtained as a by-product.
Rhenium is analogous to manganese, it
forms compounds of all oxidation states between 0 and +7, those of the higher
states being volatile and stable. Its uses are similar to those of the platinum
group metals; in particular, it is used in thermocouples, flashlights, and filaments.
|relative atomic mass
||20.5 (at 20°C)