|
| Atomic Number | 68 |
|
| Atomic Symbol | Er |
|
| Atomic Weight | 167.26 amu |
|
| Group | Rare Earth (Lanthanide Series) |
|
| Form | Solid |
|
| Density @ STP | 9.07 g/cm3 |
|
| Melting Point | 1529 °C (2784.2 °F, 1802.15 °K) |
|
| Boiling Point | 2868 °C (5194.4 °F, 3141.15 °K) |
|
| Heat of Fusion | 19.9 kJ/mol |
|
| Heat of Vaporization | 285 kJ/mol |
|
| First Ionization Potential | 6.1078 eV |
|
| Electronegativity (on Pauling scale) | 1.24 |
|
| Specific Heat Capacity | 0.168 J/g K |
|
| Ground State Electron Configuration | 4f12 5s2 5p6 6s2 |
|
| Oxidation States | +3 |
|
| Stable Isotopes and Natural Abundance on Earth | 162Er, 0.14%; 164Er, 1.61%; 166Er, 33.6%; 167Er, 22.95%; 168Er, 26.8%; 170Er, 14.9% |
|
| Atomic Radius | 226 pm |
|
| Crystal Structure | Hexagonal |
|
| Discovered by | Mosander, 1842 |
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