Template:Infobox samarium

Samarium, ₆₂Sm

File:Samarium-2.jpg
Samarium
Pronunciation	/səˈmɛəriəm/ ​(sə-MAIR-ee-əm)
Appearance	silvery white
Standard atomic weight Ar°(Sm)
	150.36±0.02 150.36±0.02 (abridged)
Samarium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Sm ↓ Pu promethium ← samarium → europium
Atomic number (Z)	62
Group	f-block groups (no number)
Period	period 6
Block	f-block
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 (at 20° C)	7.518 g/cm3
when liquid (at m.p.)	7.16 g/cm3
Heat of fusion	8.62 kJ/mol
Heat of vaporization	192 kJ/mol
Molar heat capacity	29.54 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1001 1106 1240 (1421) (1675) (2061)
Atomic properties
Oxidation states	common: +3 0, +1, +2
Electronegativity	Pauling scale: 1.17
Ionization energies	1st: 544.5 kJ/mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol
Atomic radius	empirical: 180 pm
Covalent radius	198±8 pm
Color lines in a spectral range Spectral lines of samarium
Other properties
Natural occurrence	primordial
Crystal structure	​rhombohedral (hR3)
Lattice constants	Rhombohedral crystal structure for samarium ar = 0.89834 nm α = 23.307° ah = 0.36291 nm ch = 2.6207 nm (at 20 °C)
Thermal expansion	poly: 12.7 (at r.t.) µm/(m⋅K)
Thermal conductivity	13.3 W/(m⋅K)
Electrical resistivity	α, poly: 0.940 (at r.t.) µΩ⋅m
Magnetic ordering	paramagnetic
Molar magnetic susceptibility	+1860.0×10−6 cm3/mol (291 K)
Young's modulus	49.7 GPa
Shear modulus	19.5 GPa
Bulk modulus	37.8 GPa
Speed of sound thin rod	2130 m/s (at 20 °C)
Poisson ratio	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	Lecoq de Boisbaudran (1879)
First isolation	Wilhelm Muthmann (1903)
Isotopes of samarium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 144Sm 3.08% stable 145Sm synth 340 d ε 145Pm 146Sm trace 9.20×107 y α 142Nd 147Sm 15% 1.066×1011 y α 143Nd 148Sm 11.3% 6.3×1015 y α 144Nd 149Sm 13.8% stable 150Sm 7.37% stable 151Sm synth 94.6 y β− 151Eu 152Sm 26.7% stable 153Sm synth 46.2846 h β− 153Eu 154Sm 22.7% stable

Sm · Samarium
Pm ← ibox Pm	iso 62 Sm  [] IB-Sm [] IBisos []	→ Eu ibox Eu
File:Symbol category class.svg cat:Sm (0) File:Symbol category class.svg cat:Sm-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q1819 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Sm}
Main isotopes of samarium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 144Sm 3.08% stable 145Sm synth 340 d ε 145Pm 146Sm trace 9.20×107 y α 142Nd 147Sm 15% 1.066×1011 y α 143Nd 148Sm 11.3% 6.3×1015 y α 144Nd 149Sm 13.8% stable 150Sm 7.37% stable 151Sm synth 94.6 y β− 151Eu 152Sm 26.7% stable 153Sm synth 46.2846 h β− 153Eu 154Sm 22.7% stable

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	caption: alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

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