68
167.26
Er
Erbium
Identification
CAS Number: 7440-52-0
Discovery Year: 1843
Discoverer: Carl Mosander
Discovery Location: Sweden
Properties
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
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%
