|
68
Er
167.26
Erbium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Erbium | Symbol: Er |
| Group: Rare Earth, Lanthanides | Atomic weight: 167.26 |
| Density @ 293 K: 9.05 g/cm3 | Atomic volume: 18.4 cm3/mol |
| Group: Rare Earth, Lanthanides | Discovered: 1843 |
States
| State (s, l, g): solid | |
| Melting point: 1803 K (1530 oC) | Boiling point: 3133 K (2860 oC) |
| Heat of fusion: 19.90 kJ/mol | Heat of vaporization: 261.0 kJ/mol |
Energies
| 1st ionization energy: 588.7 kJ/mole | |
| Electronegativity: 1.24 | 2nd ionization energy: 1151 kJ/mole |
| Electron affinity: 50 kJ/mole | 3rd ionization energy: 2194 kJ/mole |
| Specific heat: 0.17 J/gK | Heat atomization: 317 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,30,8,2 | Electron configuration: [Xe] 4f12 6s2 |
| Minimum oxidation number: 0 | Maximum oxidation number: 3 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 3 |
Appearance & Characteristics
| Structure: hcp: hexagonal close pkd | Color: silvery-white |
| Uses: alloys, photogr. filter | Toxicity: |
| Hardness: mohs | Characteristics: |
Reactions
| Reaction with air: vigorous, => Er2O3 | |
| Reaction with 6 M HCl: mild, => H2, ErCl3 | Reaction with 6 M HCl: mild, => H2, ErCl3 |
| Reaction with 15 M HNO3: mild, => Er(NO3)3 | Reaction with 6 M NaOH: |
Other Forms
| Number of isotopes: 6 | Hydride(s): ErH2 ErH3 |
| Oxide(s): Er2O3 | Chloride(s): ErCl3 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 176 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): 103 pm |
Conductivity
| Thermal conductivity: 14.5 J/m-sec-deg | |
| Electrical conductivity: 14.1 1/mohm-cm | Polarizability: 22.7 A^3 |
Abundance
| Source: Monazite(phosphate),bastnaesite | |
| Rel. abund. solar system: -0.601 log | Abundance earth's crust: 0.4 log |
| cost, pure: 270 $/100g | cost, bulk: $/100g |
