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Samarium,  62Sm
General properties
Name, seembol samarium, Sm
Pronunciation /səˈmɛəriəm/ sə-MAIR-ee-əm
Appearance sillery white
Samarium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer 62
Staundart atomic wicht (Ar) 150.36
Element category   lanthanide
Group, block group n/a, f-block
Period period 6
Electron configuration [Xe] 6s2 4f6
per shell
2, 8, 18, 24, 8, 2
Pheesical properties
Phase solid
Meltin pynt 1345 K ​(1072 °C, ​1962 °F)
Boilin pynt 2067 K ​(1794 °C, ​3261 °F)
Density near r.t. 7.52 g/cm3
when liquid, at m.p. 7.16 g/cm3
Heat o fusion 8.62 kJ/mol
Heat o 165 kJ/mol
Molar heat capacity 29.54 J/(mol·K)
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

(mildly basic oxide)
Electronegativity Pauling scale: 1.17
Atomic radius empirical: 180 pm
Covalent radius 198±8 pm
Crystal structur rhombohedral
Rhombohedral crystal structure for samarium
Speed o soond 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 µ Ω·m
Magnetic orderin paramagnetic[1]
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 haurdness 412 MPa
Brinell haurdness 441 MPa
CAS Registry Nummer 7440-19-9
Discovery Lecoq de Boisbaudran (1879)
First isolation Lecoq de Boisbaudran (1879)
Maist stable isotopes
Main article: Isotopes o samarium
iso NA hauf-life DM DE (MeV) DP
144Sm 3.07% - (β+β+) 1.7811 144Nd
(α) 0.0761 140Nd
145Sm syn 340 d ε - 145Pm
146Sm trace 1.03×108 y α 2.529 142Nd
147Sm 14.99% 1.06×1011 y α 2.310 143Nd
148Sm 11.24% 7×1015 y α 1.986 144Nd
149Sm 13.82% >2×1015 y (α) 1.870 145Nd
150Sm 7.38% - (α) 1.4495 146Nd
151Sm syn 90 y β - 151Eu
152Sm 26.75% - (α) 0.2203 148Nd
153Sm syn 46.284 h β - 153Eu
154Sm 22.75% >2.3×1018 y (ββ) 1.2510 154Gd
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

Samarium is a chemical element wi seembol Sm an atomic nummer 62. It is a moderately haird sillery metal that readily oxidizes in air. Bein a typical member o the lanthanide series, samarium uisually assumes the oxidation state +3. Compoonds o samarium(II) are an aa kent, maist notably the monoxide SmO, monochalcogenides SmS, SmSe an SmTe, as well as samarium(II) iodide. The last compoond is a common reducin agent in chemical synthesis. Samarium haes na signeeficant biological role an is anly slichtly toxic.

References[eedit | eedit soorce]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.