Atomic Number 95     Mass Number of Most Important Isotope (243)     

No Natural Isotopes     State solid     Color silvery white     Electronegativity 1.3    

Melting Point 994 ±4°C     Boiling Point 2607°C    

Abbreviated Electron Configuration [Rn] 5f⁷ 7s²     

Discovered by Glenn T. Seaborg and Albert Ghiorso in 1944.