Template:Infobox plutonium

Plutonium,  ₉₄Pu

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white, tarnishing to dark gray in air
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Plutonium in the periodic table
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Atomic number (Z)	94
Group	Template:Infobox element/group
Period	period 7
Block	f-block
Element category	Template:Infobox element/category format
Electron configuration	[Rn] 5f6 7s2
Electrons per shell	2, 8, 18, 32, 24, 8, 2
Physical properties
Phase at STP	solid
Melting point	912.5 K ​(639.4 °C, ​1182.9 °F)
Boiling point	3505 K ​(3228 °C, ​5842 °F)
Density (near r.t.)	19.816 g/cm3
when liquid (at m.p.)	16.63 g/cm3
Heat of fusion	2.82 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	333.5 kJ/mol
Molar heat capacity	35.5 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.28
[[Ionization energy|Template:Engvar energies]]	1st: 584.7 kJ/mol
Atomic radius	empirical: 159 pm
Covalent radius	187±1 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound	2260 m/s
Thermal expansion	46.7 µm/(m·K) (at 25 °C)
Thermal conductivity	6.74 W/(m·K)
Electrical resistivity	1.460 µΩ·m (at 0 °C)
Magnetic ordering	paramagnetic
Young's modulus	96 GPa
Shear modulus	43 GPa
Poisson ratio	0.21
CAS Number	7440-07-5
History
Naming	after dwarf planet Pluto, itself named after classical god of the underworld Pluto
Discovery	Glenn T. Seaborg, Arthur Wahl, Joseph W. Kennedy, Edwin McMillan (1940–1)
Main isotopes of plutonium
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