Atomic Number 84     Mass Number of Most Important Isotope (209)

Density 9.4 g/mL     State solid     Color silvery      No Natural Isotopes

Electronegativity 2.2     Melting Point 254°C     Boiling Point 962°C

Abbreviated Electron Configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴

Discovered by Pierre and Marie Curie in 1898.