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Dysprosium (Dy)

Dysprosium is a chemical element of the periodic table with chemical symbol Dy and atomic number 66 with an atomic weight of 162.5 u and is classed as lanthanide. Dysprosium is solid at room temperature.

Dysprosium in the periodic table

Atomic number66
AppearanceSilvery white
Color Silver
Number of protons66 p+
Number of neutrons97 n0
Number of electrons66 e-
From Wikipedia, the free encyclopediaDysprosium is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster. Dysprosium is never found in nature as a free element, though it is found in various minerals, such as xenotime.

Physical properties

Phase at STPSolid
Density8.54 g/cm3
Atomic weight162.5 u

Thermal properties

Melting point1680 K
1406.85 °C
2564.33 °F
Boiling point2840 K
2566.85 °C
4652.33 °F
Heat of vaporization230 kJ/mol

Atomic properties

Electronegativity (Pauling Scale)1.22
Electron affinity33.96 kJ/mol
Oxidation states0, +1, +2, +3, +4
(a weakly basic oxide)
Ionization energies
  1. 573 kJ/mol
  2. 1130 kJ/mol
  3. 2200 kJ/mol
  4. 3990 kJ/mol

Electron configuration for dysprosium

Electron configuration
Shorthand configuration
[Xe] 4f10 6s2
Electron configuration
Full configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f10 5s2 5p6 6s2
Electron configuration chart
Electrons per shell2, 8, 18, 28, 8, 2
Valence electrons 2
Valency electrons 3
Bohr model
DysprosiumElectron shell for Dysprosium, created by Injosoft ABDy
Figure: Shell diagram of Dysprosium (Dy) atom.
Orbital Diagram

The history of Dysprosium

DiscoveryLecoq de Boisbaudran (1886)
First isolationGeorges Urbain (1906)
Named byLecoq de Boisbaudran (1886)
Discovery of dysprosium
In 1878, erbium ores were found to contain the oxides of holmium and thulium. French chemist Paul Émile Lecoq de Boisbaudran, while working with holmium oxide, separated dysprosium oxide from it in Paris in 1886. His procedure for isolating the dysprosium involved dissolving dysprosium oxide in acid, then adding ammonia to precipitate the hydroxide. He was only able to isolate dysprosium from its oxide after more than 30 attempts at his procedure. On succeeding, he named the element dysprosium from the Greek dysprositos (δυσπρόσιτος), meaning "hard to get". The element was not isolated in relatively pure form until after the development of ion exchange techniques by Frank Spedding at Iowa State University in the early 1950s.


List of unique identifiers for Dysprosium in various chemical registry databases
CAS Number7429-91-6
ChemSpider ID22355
EC number231-073-9
PubChem CID Number23912