Relative atomic mass: [209]

English: Polonium
French: Polonium
Croatian: Polonij
German: Polonium
Italian: Polonio
Spanish: Polonio

Atomic number: 84
Group numbers: 16
Period: 6
Standard state (20 oC): solid

Discovery: 1898 Marie Sklodowska Curie, Pierre Curie (FR)
Polonium was discovered by Marie Sklodowska Curie and Pierre Curie (FR) in 1898. Named for Poland, native country of Marie Curie. It is a silvery-grey, extremely rare, highly toxic, severe radiotoxic, carcinogen, radioactive metal that is soluble in dilute acids. Polonium occurs in pitchblende. It's produced by bombarding bismuth with neutrons. It is used in industrial equipment that eliminates static electricity caused by such processes as rolling paper, wire and sheet metal.
Electronic configuration: [Xe] 4f14 5d10 6s2 6p4
Formal oxidation number: +2 +4
Atomic radius: 167.3 pm

Electronegativities: 2
Thermal conductivity: 20 W/(m K)
Electrical resistivity (20 oC): 140 microOhm cm

Melting point: 254 oC
Boiling point: 962 oC

Heat of fusion: 10 kJ/mol
Heat of vaporization: 100.8 kJ/mol
Heat of atomization: 141 kJ/mol

83Bi <= 84Po => 85At

ASCII Periodic Table of the Elements
29 Aug. 2017
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