40Zr91.224

Zirconium (Zr) – element 40

Zirconium is a chemical element with the symbol Zr and atomic number 40. It is a transition metal in group 4, period 5 of the periodic table (d-block), and is a solid at room temperature.

Zirconium (Zr) has atomic number 40, atomic mass 91.224 u and electron configuration [Kr] 4d2 5s2.

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Zirconium facts

SymbolZr
Atomic number40
Atomic mass91.224 u (g/mol)
Categorytransition metal
Groupgroup 4
Period5
Blockd-block
Phase at 20 °CSolid
Electron configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2
Noble-gas notation[Kr] 4d2 5s2
Electrons per shell2, 8, 18, 10, 2

Bohr model and shells

Zr

Zirconium has 40 electrons in 5 shells: 2, 8, 18, 10, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.

Physical and atomic properties

Melting point2128 K (1854.8 °C)
Boiling point4650 K (4376.9 °C)
Density6.52 g/cm³
Electronegativity (Pauling)1.33
Electron affinity41.806 kJ/mol
Ionization energies640.1, 1270, 2218 kJ/mol (1st, 2nd, 3rd)
Molar heat capacity25.36 J/(mol·K)
Discovered byMartin Heinrich Klaproth

Use the atomic mass in the molar mass calculator for any formula containing Zr.

Position in the periodic table

HydrogenHHeliumHeLithiumLiBerylliumBeBoronBCarbonCNitrogenNOxygenOFluorineFNeonNeSodiumNaMagnesiumMgAluminiumAlSiliconSiPhosphorusPSulfurSChlorineClArgonArPotassiumKCalciumCaScandiumScTitaniumTiVanadiumVChromiumCrManganeseMnIronFeCobaltCoNickelNiCopperCuZincZnGalliumGaGermaniumGeArsenicAsSeleniumSeBromineBrKryptonKrRubidiumRbStrontiumSrYttriumYZirconiumZrNiobiumNbMolybdenumMoTechnetiumTcRutheniumRuRhodiumRhPalladiumPdSilverAgCadmiumCdIndiumInTinSnAntimonySbTelluriumTeIodineIXenonXeCesiumCsBariumBaLanthanumLaCeriumCePraseodymiumPrNeodymiumNdPromethiumPmSamariumSmEuropiumEuGadoliniumGdTerbiumTbDysprosiumDyHolmiumHoErbiumErThuliumTmYtterbiumYbLutetiumLuHafniumHfTantalumTaTungstenWRheniumReOsmiumOsIridiumIrPlatinumPtGoldAuMercuryHgThalliumTlLeadPbBismuthBiPoloniumPoAstatineAtRadonRnFranciumFrRadiumRaActiniumAcThoriumThProtactiniumPaUraniumUNeptuniumNpPlutoniumPuAmericiumAmCuriumCmBerkeliumBkCaliforniumCfEinsteiniumEsFermiumFmMendeleviumMdNobeliumNoLawrenciumLrRutherfordiumRfDubniumDbSeaborgiumSgBohriumBhHassiumHsMeitneriumMtDarmstadtiumDsRoentgeniumRgCoperniciumCnNihoniumNhFleroviumFlMoscoviumMcLivermoriumLvTennessineTsOganessonOg

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Frequently asked questions

What is the atomic mass of zirconium?

The atomic mass of zirconium is 91.224 u, so one mole of zirconium atoms weighs 91.224 g.

What is the electron configuration of zirconium?

Zirconium has 40 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d², or [Kr] 4d² 5s² in noble-gas notation. Electrons per shell: 2, 8, 18, 10, 2.

Is zirconium a metal?

Yes. Zirconium is a transition metal.

Where is zirconium on the periodic table?

Zirconium is in group 4, period 5, in the d-block.

Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.