Atomic Number 94     Mass Number of Most Important Isotope 244

Density 19.84 g/mL    State solid     Color silvery white

Electronegativity 1.3     Melting Point 641°C     Boiling Point 3232°C

No Natural Isotopes

Abbreviated Electron Configuration [Rn] 5f⁶ 7s²

Discovered by Glenn T. Seaborg, J. W. Kennedy, E. M. McMillan, and A. C. Wahl in 1940.