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Plutonium

Metal radioactivesolid
Symbol: Pu
Atomic number: 94
Atomic mass: (244.0642)
Group: Actinide
CAS-number: 7440-07-5

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 24, 8, 2
Orbitals: [Rn] 5f6 7s2
Electronegativity: --, 1.2
1. Ionization potential: 6.06 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 5, 4, 3
Electrical conductivity: 0.00666 10^6
Melting point: 641 °C
Boiling point: 3232 °C
Specific heat: 0.13 J/gK
Heat of fusion: 2.840 kJ/mol
Heat of vaporization: 344.0 kJ/mol
Thermal conductivity: 0.0674 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: 12.32 cm³/mol
Density (293 K): 19.8 g/cm³
Crystal structure: monoclinic
monoclinic

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
236Pu 0 236.046 0 2.87y α, SF View
237Pu 0 237.048 7/2 45.2d EC, α View
238Pu 0 238.05 0 87.7y α, SF View
239Pu 0 239.052 1/2 2.41E04y α, SF View
240Pu 0 240.054 0 6.56E03y α, SF View
241Pu 0 241.057 5/2 14.4y β-, α View
242Pu 0 242.059 0 3.75E05y α, SF View
243Pu 0 243 7/2 4.956h β- View
244Pu 0 244.064 0 8.0E07y α, SF View
245Pu 0 245 9/2 10.5h β- View
246Pu 0 246 0 10.85d β- View

Other info

Name origin:Named for the planet Pluto.
Description:Silvery-white, extremely radioactive, artificially produced metal.
Discovered by:G.T.Seaborg, J.W.Kennedy, E.M.McMillan, A.C.Wohl
Year:1940
Place:United States
Sources:Found rarely in some uranium ores. Made by bombarding uranium with neutrons.
Use(s):Used in bombs and reactors. Small quantities are used in thermo-electric generators.