Zirconium (Zr)

Zirconium is a chemical element with symbol Zr and atomic number 40. The name zirconium is taken from the name of the mineral zircon, the most important source of zirconium.

Atomic Number

40

Atomic Mass

91.224 u

Category

transition metal

Phase

solid

Density

6.52 g/cm³

Electron Shells

2, 8, 18, 10, 2

Atomic Structure

Protons: 40 • Electrons: 40 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d²

Discovery

1789 • Martin Heinrich Klaproth