Samarium

Samarium,  62Sm
Samarium-2.jpg
General properties
Appearancesillery white
Staundart atomic wecht (Ar, staundart)150.36(2)
Samarium in the periodic cairt
HydrogenHelium
LithiumBerylliumBoronCarbonNitrogenOxygenFluorineNeon
SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon
PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseAirnCobaltNickelCapperZincGalliumGermaniumArsenicSeleniumBromineKrypton
RubidiumStrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSiller (element)CadmiumIndiumTinAntimonyTelluriumIodineXenon
CaesiumBariumLanthanumCeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGowdMercur (element)ThalliumLeid (element)BismuthPoloniumAstatineRadon
FranciumRadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumUnuntriumFleroviumUnunpentiumLivermoriumUnunseptiumUnunoctium
-

Sm

Pu
promethiumsamariumeuropium
Atomic nummer (Z)62
Groupgroup n/a
Periodperiod 6
Element category  lanthanide
Blockf-block
Electron confeeguration[Xe] 6s2 4f6
Electrons per shell
2, 8, 18, 24, 8, 2
Pheesical properties
Phase (at STP)solit
Meltin pynt1345 K ​(1072 °C, ​1962 °F)
Bylin pynt2067 K ​(1794 °C, ​3261 °F)
Density (near r.t.)7.52 g/cm3
when liquid (at m.p.)7.16 g/cm3
Heat o fusion8.62 kJ/mol
Heat o vapourisation165 kJ/mol
Molar heat capacity29.54 J/(mol·K)
Vapour pressur
P (Pa)1101001 k10 k100 k
at T (K)100111061240(1421)(1675)(2061)
Atomic properties
Oxidation states

4, 3, 2, 1

(mildly basic oxide)
ElectronegativityPauling scale: 1.17
Atomic radiusempirical: 180 pm
Covalent radius198±8 pm
Color lines in a spectral range
Spectral lines
Miscellanea
Creestal structur ​rhombohedral
Rhombohedral creestal structur for samarium
Speed o soond thin rod2130 m/s (at 20 °C)
Thermal expansion(r.t.) (α, poly) 12.7 µm/(m·K)
Thermal conductivity13.3 W/(m·K)
Electrical resistivity(r.t.) (α, poly) 0.940 µ Ω·m
Magnetic orderinparamagnetic[1]
Young's modulus(α form) 49.7 GPa
Shear modulus(α form) 19.5 GPa
Bouk modulus(α form) 37.8 GPa
Poisson ratio(α form) 0.274
Vickers haurdness412 MPa
Brinell haurdness441 MPa
CAS Nummer7440-19-9
History
DiskiveryLecoq de Boisbaudran (1879)
First isolationLecoq de Boisbaudran (1879)
Main isotopes o samarium
Iso­topeAbun­danceHauf-life (t1/2)Decay modePro­duct
144Sm3.07%-()Nd
(α)Nd
145Smsyn340 dεPm
146Smtrace1.03×108 yαNd
147Sm14.99%1.06×1011 yαNd
148Sm11.24%7×1015 yαNd
149Sm13.82%>2×1015 y(α)Nd
150Sm7.38%-(α)Nd
151Smsyn90 yβEu
152Sm26.75%-(α)Nd
153Smsyn46.284 hβEu
154Sm22.75%>2.3×1018 y()Gd
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

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 teepical 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

References

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