Relative atomic mass: 91.224 +- 0.002

English: Zirconium
French: Zirconium
Croatian: Cirkonij
German: Zirconium
Italian: Zirconio
Spanish: Circonio

Atomic number: 40
Group numbers: 4
Period: 5
Standard state (20 oC): solid

Discovery: 1789 Martin Heinrich Klaproth (DE)
Zirconium was discovered by Martin Heinrich Klaproth (DE) in 1789. The origin of the name comes from the Arabic word zargun meaning gold colour. It is a grey-white, lustrous, corrosion-resistant metal. Exposed surfaces form oxide protective film. Zirconium is found in many minerals such as zircon and baddeleyite. It is used in alloys such as zircaloy which is used in nuclear applications since it does not readily absorb neutrons. Zirconium is used in high-performance pumps and valves. Clear zircon (ZrSiO4) is a popular gemstone. The price of 99.5 % pure zirconium slug is 81.50 for 100 g.
Electronic configuration: [Kr] 4d2 5s2
Formal oxidation number: +4
Atomic radius: 159 pm

Electronegativities: 1.33
Thermal conductivity: 22.7 W/(m K)
Electrical resistivity (20 oC): 42.1 microOhm cm

Melting point: 1855 oC
Boiling point: 4409 oC

Heat of fusion: 23 kJ/mol
Heat of vaporization: 566.7 kJ/mol
Heat of atomization: 607.47 kJ/mol

39Y <= 40Zr => 41Nb

ASCII Periodic Table of the Elements
29 Aug. 2017
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