NO. 068Lanthanide

Er

Erbium

Erbium is used in fiber-optic communication and laser technologies.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass167.26 u

Density9.07 g/cm³

Melting Point1802 K

Boiling Point3141 K

Atomic Radius173 pm

Electronegativity1.24

Ionization Energy589 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 4f12 6s2

Discovered ByCarl Gustaf Mosander

Year1843

Known Isotopes

Er-162Er-164Er-166Er-167Er-168Er-170