Samarium (Sm)

Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that slowly oxidizes in air.

Atomic Number

62

Atomic Mass

150.36 u

Category

lanthanide

Phase

solid

Density

7.52 g/cm³

Electron Shells

2, 8, 18, 24, 8, 2

Atomic Structure

Protons: 62 • Electrons: 62 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁶

Discovery

1879 • Lecoq de Boisbaudran