Template:Infobox samarium

Samarium,  ₆₂Sm

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Samarium in the periodic table
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Atomic number (Z)	62
Group	Template:Infobox element/group
Period	period 6
Block	f-block
Element category	Template:Infobox element/category format
Electron configuration	[Xe] 4f6 6s2
Electrons per shell	2, 8, 18, 24, 8, 2
Physical properties
Phase at STP	solid
Melting point	1345 K ​(1072 °C, ​1962 °F)
Boiling point	2173 K ​(1900 °C, ​3452 °F)
Density (near r.t.)	7.52 g/cm3
when liquid (at m.p.)	7.16 g/cm3
Heat of fusion	8.62 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	192 kJ/mol
Molar heat capacity	29.54 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: 1.17
[[Ionization energy|Template:Engvar energies]]	1st: 544.5 kJ/mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol
Atomic radius	empirical: 180 pm
Covalent radius	198±8 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	2130 m/s (at 20 °C)
Thermal expansion	(r.t.) (α, poly) 12.7 µm/(m·K)
Thermal conductivity	13.3 W/(m·K)
Electrical resistivity	(r.t.) (α, poly) 0.940 µΩ·m
Magnetic ordering	paramagnetic
Magnetic susceptibility	+1860.0·10−6 cm3/mol (291 K)
Young's modulus	α form: 49.7 GPa
Shear modulus	α form: 19.5 GPa
Bulk modulus	α form: 37.8 GPa
Poisson ratio	α form: 0.274
Vickers hardness	410–440 MPa
Brinell hardness	440–600 MPa
CAS Number	7440-19-9
History
Naming	after the mineral samarskite (itself named after Vassili Samarsky-Bykhovets)
Discovery and first isolation	Lecoq de Boisbaudran (1879)
Main isotopes of samarium
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