NO. 040Transition

Zr

Zirconium

Zirconium is a strong, corrosion-resistant metal widely used in nuclear reactors and chemical equipment.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass91.22 u

Density6.52 g/cm³

Melting Point2128 K

Boiling Point4650 K

Atomic Radius160 pm

Electronegativity1.33

Ionization Energy640 kJ/mol

Electron Affinity41 kJ/mol

Bonding TypeMetallic

Oxidation States4

Acid/BaseBasic

ReactivityLow

Electron Configuration

[Kr] 4d2 5s2

Discovered ByMartin Heinrich Klaproth

Year1789

Known Isotopes

Zr-90Zr-91Zr-92Zr-94Zr-96