68Er167.26
Erbium
Lanthanide
Solid at STP
Period 6Block FDiscovered 1843
[Xe]6s2 4f12
Erbium is a chemical element in the lanthanide series, with symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth. As such, it is a rare earth element which is associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden, where yttrium, ytterbium, and terbium were discovered.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 68 |
| Atomic Mass | 167.26 u |
| Electron Configuration | [Xe]6s2 4f12 |
| Oxidation States | +3 |
| Electronegativity | 1.24 (Pauling) |
| Atomic Radius | 235 pm |
| Ionization Energy | 6.108 eV |
| Block | F |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 1802 K (1528.8 °C) |
| Boiling Point | 3141 K (2867.8 °C) |
| Density | 9.07 g/cm³ |
| Molar Heat | 28.12 J/(mol·K) |
Classification
| Category | Lanthanide |
| Group Block | Lanthanide |
| Period | 6 |
| Block | F |
Discovery
| Year Discovered | 1843 |
| Discovered By | Carl Gustaf Mosander |
| Electron Shells | 2, 8, 18, 30, 8, 2 |