77Ir192.22

Iridium (Ir) – element 77

Iridium is a chemical element with the symbol Ir and atomic number 77. It is a transition metal in group 9, period 6 of the periodic table (d-block), and is a solid at room temperature.

Iridium (Ir) has atomic number 77, atomic mass 192.22 u and electron configuration [Xe] 4f14 5d7 6s2.

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Iridium facts

SymbolIr
Atomic number77
Atomic mass192.22 u (g/mol)
Categorytransition metal
Groupgroup 9
Period6
Blockd-block
Phase at 20 °CSolid
Electron configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d7
Noble-gas notation[Xe] 4f14 5d7 6s2
Electrons per shell2, 8, 18, 32, 15, 2

Bohr model and shells

Ir

Iridium has 77 electrons in 6 shells: 2, 8, 18, 32, 15, 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 point2719 K (2445.8 °C)
Boiling point4403 K (4129.9 °C)
Density22.56 g/cm³
Electronegativity (Pauling)2.2
Electron affinity150.94 kJ/mol
Ionization energies880, 1600 kJ/mol (1st, 2nd)
Molar heat capacity25.1 J/(mol·K)
Discovered bySmithson Tennant

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

Position in the periodic table

HydrogenHHeliumHeLithiumLiBerylliumBeBoronBCarbonCNitrogenNOxygenOFluorineFNeonNeSodiumNaMagnesiumMgAluminiumAlSiliconSiPhosphorusPSulfurSChlorineClArgonArPotassiumKCalciumCaScandiumScTitaniumTiVanadiumVChromiumCrManganeseMnIronFeCobaltCoNickelNiCopperCuZincZnGalliumGaGermaniumGeArsenicAsSeleniumSeBromineBrKryptonKrRubidiumRbStrontiumSrYttriumYZirconiumZrNiobiumNbMolybdenumMoTechnetiumTcRutheniumRuRhodiumRhPalladiumPdSilverAgCadmiumCdIndiumInTinSnAntimonySbTelluriumTeIodineIXenonXeCesiumCsBariumBaLanthanumLaCeriumCePraseodymiumPrNeodymiumNdPromethiumPmSamariumSmEuropiumEuGadoliniumGdTerbiumTbDysprosiumDyHolmiumHoErbiumErThuliumTmYtterbiumYbLutetiumLuHafniumHfTantalumTaTungstenWRheniumReOsmiumOsIridiumIrPlatinumPtGoldAuMercuryHgThalliumTlLeadPbBismuthBiPoloniumPoAstatineAtRadonRnFranciumFrRadiumRaActiniumAcThoriumThProtactiniumPaUraniumUNeptuniumNpPlutoniumPuAmericiumAmCuriumCmBerkeliumBkCaliforniumCfEinsteiniumEsFermiumFmMendeleviumMdNobeliumNoLawrenciumLrRutherfordiumRfDubniumDbSeaborgiumSgBohriumBhHassiumHsMeitneriumMtDarmstadtiumDsRoentgeniumRgCoperniciumCnNihoniumNhFleroviumFlMoscoviumMcLivermoriumLvTennessineTsOganessonOg

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Frequently asked questions

What is the atomic mass of iridium?

The atomic mass of iridium is 192.22 u, so one mole of iridium atoms weighs 192.22 g.

What is the electron configuration of iridium?

Iridium has 77 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁷, or [Xe] 4f¹⁴ 5d⁷ 6s² in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 15, 2.

Is iridium a metal?

Yes. Iridium is a transition metal.

Where is iridium on the periodic table?

Iridium is in group 9, period 6, 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.