Periodic Table of Elements




Polonium was discovered in 1898 by Polish-French physicist Marie Curie (1867-1934) and her husband, Pierre Curie (1859-1906).

Name: Polonium
Symbol: Po
Atomic number: 84
Atomic weight: 208.98
State: solid
Group, period, block: 16, 6, p
Color: silvery
Classification: metalloid
Electron configuration: 6s2 4f14 5d10 6p4

Physical properties

Density: 9.196 g/cm-3
Melting point: 527 K,254 C,489 F
Boiling point: 1235 K,962 C,1764 F

Atomic properties

Oxidation states: 6, 4, 2, -2
Electronegativity: 2.0 (Pauling scale)
Ionization energies: 1st: 812.1 kJmol-1
Covalent radius: 1404 pm
Van der Waals radius: 197 pm
  • Po
  • Electron Configuration


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.