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Samarium

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Chemical element with atomic number 62Àdàkọ:SHORTDESC:Chemical element with atomic number 62
Samarium, 62Sm
Samarium
Pípè/səˈmɛəriəm/​(sə-MAIR-ee-əm)
Ìhànsójúsilvery white
Ìwúwo átọ̀mùAr, std(Sm)150.36(2)[1]
Samarium ní orítábìlì àyè
HydrogenHelium
LithiumBerylliumBoronCarbonNitrogenOxygenFluorineNeon
SodiumMagnesiumAluminiumSiliconPhosphorusSulfurChlorineArgon
PotassiumCalciumScandiumTitaniumVanadiumChromiumManganeseIronCobaltNickelCopperZincGalliumGermaniumArsenicSeleniumBromineKrypton
RubidiumStrontiumYttriumZirconiumNiobiumMolybdenumTechnetiumRutheniumRhodiumPalladiumSilverCadmiumIndiumTinAntimonyTelluriumIodineXenon
CaesiumBariumLanthanumCeriumPraseodymiumNeodymiumPromethiumSamariumEuropiumGadoliniumTerbiumDysprosiumHolmiumErbiumThuliumYtterbiumLutetiumHafniumTantalumTungstenRheniumOsmiumIridiumPlatinumGoldMercury (element)ThalliumLeadBismuthPoloniumAstatineRadon
FranciumRadiumActiniumThoriumProtactiniumUraniumNeptuniumPlutoniumAmericiumCuriumBerkeliumCaliforniumEinsteiniumFermiumMendeleviumNobeliumLawrenciumRutherfordiumDubniumSeaborgiumBohriumHassiumMeitneriumDarmstadtiumRoentgeniumCoperniciumNihoniumFleroviumMoscoviumLivermoriumTennessineOganesson
-
↑
Sm
↓
Pu
promethium ←samarium →europium
Nọ́mbà átọ̀mù(Z)62
Ẹgbẹ́group n/a
Àyèàyè 6
Àdìpọ̀Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù[Xe] 4f6 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 24, 8, 2
Àwọn ohun ìní ara
Ìfarahànat STPsolid
Ìgbà ìyọ́1345 K​(1072 °C,​1962 °F)
Ígbà ìhó2067 K​(1794 °C,​3261 °F)
Kíki(near r.t.)7.52 g/cm3
when liquid (at m.p.)7.16 g/cm3
Heat of fusion8.62 kJ/mol
Heat of165 kJ/mol
Molar heat capacity29.54 J/(mol·K)
 pressure
P (Pa)1101001 k10 k100 k
at T (K)100111061240(1421)(1675)(2061)
Atomic properties
Oxidation states0,[2] +2,+3Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
ElectronegativityPauling scale: 1.17
Atomic radiusempirical:180 pm
Covalent radius198±8 pm
Color lines in a spectral range
Color lines in a spectral range
Spectral lines of samarium
Other properties
Natural occurrenceprimordial
Crystal structure​rhombohedral
Rhombohedral crystal structure for samarium
Speed of soundthin 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 orderingparamagnetic[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 hardness412 MPa
Brinell hardness441 MPa
CAS Number7440-19-9
Mainisotopes of samarium
Iso­topeAbun­danceHalf-life(t1/2)Decay modePro­duct
144Sm3.07%144Sm isstable with 82neutrons
146Smsyn1.03×108yα2.529142Nd
147Sm14.99%1.06×1011yα2.310143Nd
148Sm11.24%7×1015yα1.986144Nd
149Sm13.82%>2×1015yα1.870145Nd
150Sm7.38%150Sm isstable with 88neutrons
152Sm26.75%152Sm isstable with 90neutrons
154Sm22.75%154Sm isstable with 92neutrons
Àdàkọ:Category-inline
|references

Samarium (pípè/səˈmɛəriəm/,sə-MAIR-ee-əm) jeapilese kemika to ni ami-idamoSm atinomba atomu 62.

Àyọkà yìí tàbí apá rẹ̀ únfẹ́ àtúnṣe sí.

Ẹ lefẹ̀ jù báyìí lọ tàbí kí ẹṣàtúnṣe rẹ̀ lọ́nà tí yíò mu kúnrẹ́rẹ́. Ẹ ran Wikipedia lọ́wọ́ látifẹ̀ẹ́ jù báyìí lọ.

Itokasi

[àtúnṣe |àtúnṣe àmìọ̀rọ̀]
  1. ↑Meija,Juris;Coplen,Tyler B.;Berglund,Michael;Brand,Willi A.;De Bièvre,Paul;Gröning,Manfred;Holden,Norman E.;Irrgeher,Johannaet al.(2016)."Atomic weights of the elements 2013 (IUPAC Technical Report)".Pure and Applied Chemistry88(3): 265–91.doi:10.1515/pac-2015-0305. 
  2. ↑Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, seeCloke,F. Geoffrey N.(1993)."Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides".Chem. Soc. Rev.22: 17–24.doi:10.1039/CS9932200017. 
  3. ↑Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
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