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Zirconium (Zr)

Zirconium (Zr) is element 40 of the periodic table, a transition metal in period 5 and group 4. Its standard atomic weight is 91.224, so one mole of zirconium atoms has a mass of 91.224 g. At room temperature it is a solid; it melts at 1854.85 °C and boils at 4408.85 °C.

40 Zr Zirconium 91.224

Period 5, group 4 · Transition metal

← Y Yttrium Nb Niobium →

Atomic number	40
Symbol	Zr
Standard atomic weight	91.224
Molar mass	91.224 g/mol
Category	Transition metal
Group	4
Period	5
Block	d-block
Electron configuration	[Kr] 5s² 4d²
Oxidation states	+4
Electronegativity (Pauling)	1.33
Atomic radius (van der Waals)	186 pm
First ionisation energy	6.634 eV (640.1 kJ/mol)
Electron affinity	0.426 eV
State at room temperature	Solid
Melting point	2128 K (1854.85 °C)
Boiling point	4682 K (4408.85 °C)
Density	6.52 g/cm³
Discovered	1789

Group 4

Ti · Titanium Hf · Hafnium Rf · Rutherfordium

Calculate with Zirconium

Molar mass of Zr Balance an equation Grams, moles and particles Whole periodic table

Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.