Antimony (Sb)

Antimony is a chemical element with symbol Sb and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite.

Atomic Number

51

Atomic Mass

121.76 u

Category

metalloid

Phase

solid

Density

6.697 g/cm³

Electron Shells

2, 8, 18, 18, 5

Atomic Structure

Protons: 51 • Electrons: 51 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p³

Discovery

Unknown