Plutonium

Metal

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

Navigation
Sm

Np				Am

Go to element

⬇

Physical data

Electronic 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

Thermal data

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

Steric data

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

⬆⬇

Isotopes

Nuclide	Mass	Spin	Halflife	Decay mode	Decay tree
²³⁶Pu	236.046	0	2.87y	α, SF	View
²³⁷Pu	237.048	7/2	45.2d	EC, α	View
²³⁸Pu	238.05	0	87.7y	α, SF	View
²³⁹Pu	239.052	1/2	2.41E04y	α, SF	View
²⁴⁰Pu	240.054	0	6.56E03y	α, SF	View
²⁴¹Pu	241.057	5/2	14.4y	β-, α	View
²⁴²Pu	242.059	0	3.75E05y	α, SF	View
²⁴³Pu	243	7/2	4.956h	β-	View
²⁴⁴Pu	244.064	0	8.0E07y	α, SF	View
²⁴⁵Pu	245	9/2	10.5h	β-	View
²⁴⁶Pu	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.

⬆