66
162.50
Dy
Dysprosium
Identification
CAS Number: 7429-91-6
Discovery Year: 1886
Discoverer: Paul Émile Lecoq de Boisbaudran
Discovery Location: France
Properties
Atomic Dimensions
Atomic Radius: 175 pm →
Atomic Radius (Rahm): 275 pm
Covalent Radius: 192 pm →Van der Waals Radius: 231 pm
Atomic Volume: 19 cm³/mol
Lattice Constant: 3.59 Å
Thermodynamics
Electronic Structure
Electron Config: [Xe] 4f10 6s2
Block: f
Period: 6 →Electronegativity: 1.22 →Electron Affinity: 0.35200000000000004 eV →Oxidation States: +3
Abundance & Geochemistry
Crust Abundance: 5.2 mg/kg
Sea Abundance: 9.1e-7 mg/L
Geochemical Class: rare earth & related
Goldschmidt Class: litophile
About
Metallic with a bright silvery-white lustre. Dysprosium belongs to the lanthanoids. It is relatively stable in air at room temperatures, it will however dissolve in mineral acids, evolving hydrogen. It is found in from rare-earth minerals. There are seven natural isotopes of dysprosium, and eight radioisotopes, Dy-154 being the most stable with a half-life of 3*10^6 years. Dysprosium is used as a neutron absorber in nuclear fission reactions, and in compact disks. It was discovered by Paul Emile Lecoq de Boisbaudran in 1886 in France. Its name comes from the Greek word dysprositos, which means hard to obtain.
Isotopes
Dy-164 164 28.26%
Dy-162 162 25.47%
Dy-163 163 24.90%
Dy-161 161 18.89%
Dy-160 160 2.33%
Dy-158 158 0.0950%
Dy-156 156 0.0560%
