Atomic Number 75     Atomic Mass 186.207     Density 20.5 g/mL

State solid     Color silvery white     Electronegativity 2.2

Melting Point 3180°C     Boiling Point 5627°C

Natural Isotopes Re-185 37.40%   Re-187 62.60%

Abbreviated Electron Configuration [Xe] 4f¹⁴ 5d⁵ 6s²

Discovered by Walter Noddack, Ida Tacke, and Otto Berg in 1925.