Chemicool

Sm

62

150.4
Samarium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General

Name Samarium Symbol Sm
atomic number 62 Atomic weight 150.4
Density @ 293 K 7.54 g/cm3 Atomic volume 19.95 cm3/mol
Group Rare Earth, Lanthanides discovered 1880

States

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
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Energies

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
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Appearance & Characteristics

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

Reactions

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
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Other Forms

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

Radius

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
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Conductivity

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

Abundance

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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