Template:Infobox zirconium

Zirconium,  ₄₀Zr

Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Zirconium in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	40
Group	Template:Infobox element/group
Period	period 5
Block	d-block
Element category	Template:Infobox element/category format
Electron configuration	[Kr] 4d2 5s2
Electrons per shell	2, 8, 18, 10, 2
Physical properties
Phase at STP	solid
Melting point	2128 K ​(1855 °C, ​3371 °F)
Boiling point	4650 K ​(4377 °C, ​7911 °F)
Density (near r.t.)	6.52 g/cm3
when liquid (at m.p.)	5.8 g/cm3
Heat of fusion	14 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	591 kJ/mol
Molar heat capacity	25.36 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.33
[[Ionization energy|Template:Engvar energies]]	1st: 640.1 kJ/mol 2nd: 1270 kJ/mol 3rd: 2218 kJ/mol
Atomic radius	empirical: 160 pm
Covalent radius	175±7 pm
Template:Infobox element/spectral lines
Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	3800 m/s (at 20 °C)
Thermal expansion	5.7 µm/(m·K) (at 25 °C)
Thermal conductivity	22.6 W/(m·K)
Electrical resistivity	421 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	88 GPa
Shear modulus	33 GPa
Bulk modulus	91.1 GPa
Poisson ratio	0.34
Mohs hardness	5.0
Vickers hardness	820–1800 MPa
Brinell hardness	638–1880 MPa
CAS Number	7440-67-7
History
Naming	after zircon, zargun زرگون meaning "gold-colored".
Discovery	Martin Heinrich Klaproth (1789)
First isolation	Jöns Jakob Berzelius (1824)
Main isotopes of zirconium
Template:Infobox element/isotopes table