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Samarium,  62Sm
Samarium-2.jpg
General properties
Pronunciation /səˈmɛəriəm/ (sə-MAIR-ee-əm)
Appearance silvery white
Standard atomic weight (Ar, standard) 150.36(2)[1]
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
promethiumsamariumeuropium
Atomic number (Z) 62
Group group n/a
Period period 6
Element category   lanthanide
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 (near r.t.) 7.52 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 4, 3, 2, 1 ​(a mildly basic oxide)
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
Miscellanea
Crystal structure rhombohedral
Rhombohedral crystal structure for samarium
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[2]
Magnetic susceptibility +1860.0·10−6 cm3/mol (291 K)[3]
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
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
144Sm 3.08% stable
145Sm syn 340 d ε 145Pm
146Sm syn 6.8×107 y α 142Nd
147Sm 15.00% 1.06×1011 y α 143Nd
148Sm 11.25% 7×1015 y α 144Nd
149Sm 13.82% stable
150Sm 7.37% stable
151Sm syn 90 y β 151Eu
152Sm 26.74% stable
153Sm syn 46.284 h β 153Eu
154Sm 22.74% stable
| references | in Wikidata

Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3. Compounds of samarium(II) are also known, most notably the monoxide SmO, monochalcogenides SmS, SmSe and SmTe, as well as samarium(II) iodide. The last compound is a common reducing agent in chemical synthesis. Samarium has no significant biological role and is only slightly toxic.

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  1. ^ Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. ^ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 
  3. ^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.