1. 75
Rhenium -
Renio
Mass: 131,293 u
(Kr) 4f14
5d5
6s2
Melting point: 3459 K
Boiling point: 5869 K
Density: 21 g/cm3
Discovery: Ida Eva Tacke, Karl Friedich
and Otto Berg, 1925
It's used in alloys for welding rods, magnets and cryogenic
electrical filaments camera flashes and also is used as a catalyst.