Erbium was discovered by the Swedish chemist, Carl Gustaf Mosander in 1843.
Name: Erbium Symbol: Er Atomic number: 68 Atomic weight: 167.26 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron configuration: 4f12 6s2
Density: 9.066 g/cm-3 Melting point: 1802 K,1529 °C,2784 °F Boiling point: 3141 K,2868 °C,5194 °F
Oxidation states: 3, 2, 1 Electronegativity: 1.24 (Pauling scale) Ionization energies: 1st: 589.3 kJ·mol-1 Covalent radius: 189±6 pm Van der Waals radius: no data
There are six naturally occurring isotopes of erbium exist, 162Er, 164Er, 166Er, 167Er, 168Er, and 170Er. About 33.503% of the erbium in nature is 166Er.