Zirconium (Zr) — Element 40

40 Zr 91.224

Zirconium

Element 40 · 91.224 u · d-block

transition metal

A lustrous, corrosion-resistant metal. Used in nuclear reactor cladding and cubic zirconia gemstones.

Phase (STP)

Solid

Melting Point

1855 °C

Boiling Point

4409 °C

Density

6.506 g/cm³

Electronegativity

1.33

Atomic Radius

155 pm

Ionization Energy

640 kJ/mol

Electron Affinity

41 kJ/mol

Discovered

1789 · Martin Heinrich Klaproth

Electron Configuration

[Kr] 4d2 5s2