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Zirconium (Zr)

From Wikipedia, the free encyclopediaZirconium is a chemical element with symbol Zr and atomic number 40. The name of zirconium is taken from the name of the mineral zircon, the most important source of zirconium. The word zircon comes from the Persian word zargun زرگون, meaning "gold-colored".

Zirconium in the periodic table

Atomic number40
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density6.52 g/cm3
Atomic weight91.2242 u
Melting point2128 K
1854.85 °C
3370.73 °F
Boiling point4650 K
4376.85 °C
7910.33 °F

Atomic properties

Electronegativity (Pauling Scale)1.33
Electron affinity41.806 kJ/mol
Oxidation states−2, 0, +1, +2, +3, +4
(an amphoteric oxide)
Ionization energies
1640.1 kJ/mol
2 1270 kJ/mol
3 2218 kJ/mol
4 3313 kJ/mol
5 7752 kJ/mol
6 9500 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Kr] 4d2 5s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2
Electrons per shell2, 8, 18, 10, 2


Discovered byMartin Heinrich Klaproth
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