Relative atomic mass: [244]

English: Plutonium
French: Plutonium
Croatian: Plutonij
German: Plutonium
Italian: Plutonio
Spanish: Plutonio

Atomic number: 94
Group numbers: 3
Period: 7
Standard state (20 oC): solid

Discovery: 1940 Glenn Theodore Seaborg, Joseph W. Kennedy, Arthur C. Wahl (US)
Plutonium was discovered by Glenn Theodore Seaborg, Joseph W. Kennedy, and Arthur C. Wahl (US) in 1940. Named after the planet Pluto. It is a silvery-white, extremely radioactive, highly toxic, artificially produced metal that reacts with oxygen, acids and steam, but it resists alkalis. Plutonium is rarely found in uranium ores. It can be made by bombarding uranium with neutrons. Plutonium was used in bombs and reactors. Small quantities are used in thermo-electric generators.
Electronic configuration: [Rn] 5f6 7s2
Formal oxidation number: +3 +4 +5 +6
Atomic radius: 151.3 pm

Electronegativities: 1.3
Thermal conductivity: 6.74 W/(m K)
Electrical resistivity (20 oC): 150 microOhm cm

Melting point: 640 oC
Boiling point: 3228 oC

Heat of fusion: 2.8 kJ/mol
Heat of vaporization: 343.5 kJ/mol
Heat of atomization: 348 kJ/mol

93Np <= 94Pu => 95Am

ASCII Periodic Table of the Elements
29 Aug. 2017
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