|
62
Sm
150.4
Samarium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| 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 |
States
| State (s, l, g): solid | |
| Melting point: 1345.2 K | Boiling point: 2073 K |
| Heat of fusion: 8.630 kJ/mol | Heat of vaporization: 166.40 kJ/mol |
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 |
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 6 M HCl: mild, => H2, SmCl3 | Reaction with 6 M HCl: mild, => H2, SmCl3 |
| Reaction with 15 M HNO3: mild, => Sm(NO3)3 | Reaction with 6 M NaOH: |
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 |
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 | |
| cost, pure: 130 $/100g | cost, bulk: $/100g |
