Polonium Facts - Element 84 or Po

Polonium (Po or Element 84) is one of the radioactive elements discovered by Marie and Pierre Curie. This rare element has no stable isotopes. It's found in uranium ores and cigarette smoke and also occurs as a decay product of heavier elements. Although there aren't many applications for the element, it is used to generate heat from radioactive decay for space probes. The element is used as a neutron and alpha source and in anti-static devices. Polonium has also been used as a poison to commit assassinations. Although the position of element 84 on the periodic table would lead to categorization as a metalloid, its properties are those of a true metal.

Polonium Basic Facts

Symbol: Po

Atomic Number: 84

Discovery: Curie 1898

Atomic weight: [208.9824]

Electron configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴

Classification: semi-metal

Ground level: ³P₂

Polonium Physical Data

Ionization potential: 8.414 ev

Physical form: Silvery metal

Melting point: 254°C

Boiling point: 962°C

Density: 9.20 g/cm3

Valence: 2, 4

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC (2006)