Polonium was discovered in 1898 by Polish-French physicist Marie Curie (1867-1934) and her husband, Pierre Curie (1859-1906).
Atomic number: 84
Atomic weight: 208.98
Group, period, block: 16, 6, p
Electron configuration: 6s2 4f14 5d10 6p4
Density: 9.196 g/cm-3
Melting point: 527 K,254 °C,489 °F
Boiling point: 1235 K,962 °C,1764 °F
Oxidation states: 6, 4, 2, -2
Electronegativity: 2.0 (Pauling scale)
Ionization energies: 1st: 812.1 kJ·mol-1
Covalent radius: 140±4 pm
Van der Waals radius: 197 pm
There are 27 naturally occurring isotopes of polonium exist. All of these isotopes are radioactive. 210Po is the predominant naturally occurring isotope of polonium and
the one most widely used.