Periodic Table of Elements




Dysprosium was discovered in 1886 by a French chemist, P. E. Lecoq de Boisbaudran in 1886.

Name: Dysprosium
Symbol: Dy
Atomic number: 66
Atomic weight: 162.50
State: solid
Group, period, block: n/a, 6, f
Color: silvery white
Classification: lanthanide
Electron configuration: 4f10 6s2

Physical properties

Density: 8.540 g/cm-3
Melting point: 1680 K,1407 C,2565 F
Boiling point: 2840 K,2562 C,4653 F

Atomic properties

Oxidation states: 3, 2, 1
Electronegativity: 1.22 (Pauling scale)
Ionization energies: 1st: 573.0 kJmol-1
Covalent radius: 1927 pm
Van der Waals radius: no data
  • Dy
  • Electron Configuration


There are seven naturally occurring isotopes of dysprosium exist, 156Dy, 158Dy, 160Dy, 161Dy, 162Dy, 163Dy and 164Dy. About 28.18% of the dysprosium in nature is 164Dy.