The chemical symbol for Zirconium is Zr and its atomic number is 40.
We find it listed in the periodic table in Group 4 and 5 period and block.
Zirconium belongs to the family or chemical series of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is stable.
Zirconium was named after the tree Zarkoen.
Atomic number (Z) 40
Group, block group 4, d-block
Period: period 5
Element category: transition metal
Standard atomic weight (±) (Ar): 91.224(2)
Electron configuration: [Kr] 4d2 5s2
per shell 2, 8, 18, 10, 2
Physical properties
Phase: 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
Heat of vaporization: 591 kJ/mol
Molar heat capacity: 25.36 J/(mol•K)
Atomic properties
Oxidation states: 4, 3, 2, 1, −2 (an amphoteric oxide)
Electronegativity: Pauling scale: 1.33
Ionization energies: 1st: 640.1 kJ/mol
2nd: 1270 kJ/mol
3rd: 2218 kJ/mol
Atomic radius empirical: 160 pm
Covalent radius: 175±7 pm
Crystal structure: hexagonal close-packed
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