Erbium (Er)
Erbium (Er) is element 68 of the periodic table, a lanthanide in period 6, in the f-block. Its standard atomic weight is 167.259, so one mole of erbium atoms has a mass of 167.259 g. At room temperature it is a solid; it melts at 1528.85 °C and boils at 2867.85 °C.
| Atomic number | 68 |
|---|---|
| Symbol | Er |
| Standard atomic weight | 167.259 |
| Molar mass | 167.259 g/mol |
| Category | Lanthanide |
| Group | f-block (lanthanide series) |
| Period | 6 |
| Block | f-block |
| Electron configuration | [Xe] 6s2 4f12 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.24 |
| Atomic radius (van der Waals) | 235 pm |
| First ionisation energy | 6.108 eV (589.3 kJ/mol) |
| Electron affinity | — |
| State at room temperature | Solid |
| Melting point | 1802 K (1528.85 °C) |
| Boiling point | 3141 K (2867.85 °C) |
| Density | 9.07 g/cm³ |
| Discovered | 1843 |
Lanthanides
La · LanthanumCe · CeriumPr · PraseodymiumNd · NeodymiumPm · PromethiumSm · SamariumEu · EuropiumGd · GadoliniumTb · TerbiumDy · DysprosiumHo · HolmiumTm · ThuliumYb · Ytterbium
Calculate with Erbium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.