Atomic Number 40     Atomic Mass 91.224     Density 6.49 g/mL

State solid     Color silvery white      Electronegativity 1.33

Melting Point 1852°C     Boiling Point 4377°C

Natural Isotopes Zr-90 51.45%   Zr-91 11.22%   Zr-92 17.15%
                            Zr-94 17.38%   Zr-96 2.80%

Abbreviated Electron Configuration [Kr] 4d² 5s²

Discovered by Martin Klaproth in 1789.