Samarium element properties

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Name: Samarium Symbol: Sm
Group: Rare Earth, Lanthanides Atomic weight: 150.4
Density @ 293 K: 7.54 g/cm3 Atomic volume: 19.95 cm3/mol
Group: Rare Earth, Lanthanides discovered: 1880


state (s, l, g): s
melting point: 1345.2 K boiling point: 2073 K
Heat of fusion: 8.630 kJ/mol Heat of vaporization: 166.40 kJ/mol


1st ionization energy: 543.3 kJ/mole
electronegativity: 1.17 2nd ionization energy: 1068 kJ/mole
electron affinity: 50 kJ/mole 3rd ionization energy: 2260 kJ/mole
Specific heat: 0.20 J/gK heat atomization: 207 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,24,8,2 electron configuration: [Xe] 4f6 6s2
minimum oxidation number: 0 maximum oxidation number: 3
min. common oxidation no.: 0 max. common oxidation no.: 3

Appearance & Characteristics:

structure: cp: cls pkd (ABCBCACAB) color: silvery-white
uses: alloys, headphones toxicity:
hardness: mohs characteristics:


reaction with air: vigorous, =>Sm2O3
reaction with 6M HCl: mild, =>H2, SmCl3 reaction with 6M HCl: mild, =>H2, SmCl3
reaction with 15M HNO3: mild, =>Sm(NO3)3 reaction with 6M NaOH:

Other Forms:

number of isotopes: 7 hydride(s): SmH2 SmH3
oxide(s): Sm2O3 chloride(s): SmCl2 SmCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 180 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 109.8 pm


thermal conductivity: 13.3 J/m-sec-deg
electrical conductivity: 11 1/mohm-cm polarizability: 28.8 A^3


source: Monazite(phosphate),bastnaesite
rel. abund. solar system: -0.588 log abundance earth's crust: 0.8 log
cost, pure: 130 $/100g cost, bulk: $/100g

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