Er

Erbium

Identification

CAS Number: 7440-52-0

Discovery Year: 1843

Discoverer: Carl Mosander

Discovery Location: Sweden

Properties

Atomic Mass: 167.259 →Density: 9.07 g/cm³ →

Crust Abundance: 3.5 mg/kg

Crystal Structure: HEX

Atomic Dimensions

Atomic Radius: 175 pm →

Atomic Radius (Rahm): 272 pm

Covalent Radius: 189 pm →

Van der Waals Radius: 229 pm

Atomic Volume: 18.4 cm³/mol

Lattice Constant: 3.56 Å

Thermodynamics

Melting Point: 1802 K →Boiling Point: 3136 K →Specific Heat: 0.168 J/(g·K) →Heat of Vaporization: 317 kJ/mol →

Heat of Formation: 316.4 kJ/mol

Electronic Structure

Electron Config: [Xe] 4f12 6s2

Block: f

Period: 6 →Electronegativity: 1.24 →

Oxidation States: +3

Abundance & Geochemistry

Crust Abundance: 3.5 mg/kg

Sea Abundance: 8.7e-7 mg/L

Geochemical Class: rare earth & related

Goldschmidt Class: litophile

About

Soft silvery metallic element which belongs to the lanthanoids. Six natural isotopes that are stable. Twelve artificial isotopes are known. Used in nuclear technology as a neutron absorber. It is being investigated for other possible uses. Discovered by Carl G. Mosander in 1843.

Isotopes

Er-166 166 33.50%

Er-168 168 26.98%

Er-167 167 22.87%

Er-170 170 14.91%

Er-164 164 1.60%

Er-162 162 0.1390%