Dysprosium (Dy)

Dysprosium is a chemical element with symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster.

Atomic Number

66

Atomic Mass

162.5 u

Category

lanthanide

Phase

solid

Density

8.55 g/cm³

Electron Shells

2, 8, 18, 28, 8, 2

Atomic Structure

Protons: 66 • Electrons: 66 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁰

Discovery

1886 • Lecoq de Boisbaudran