44Ru101.07

Ruthenium (Ru) – element 44

Ruthenium is a chemical element with the symbol Ru and atomic number 44. It is a transition metal in group 8, period 5 of the periodic table (d-block), and is a solid at room temperature.

Ruthenium (Ru) has atomic number 44, atomic mass 101.07 u and electron configuration [Kr] 4d7 5s1.

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Ruthenium facts

SymbolRu
Atomic number44
Atomic mass101.07 u (g/mol)
Categorytransition metal
Groupgroup 8
Period5
Blockd-block
Phase at 20 °CSolid
Electron configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d7
Noble-gas notation[Kr] 4d7 5s1
Electrons per shell2, 8, 18, 15, 1

Bohr model and shells

Ru

Ruthenium has 44 electrons in 5 shells: 2, 8, 18, 15, 1. 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 point2607 K (2333.8 °C)
Boiling point4423 K (4149.9 °C)
Density12.45 g/cm³
Electronegativity (Pauling)2.2
Electron affinity100.96 kJ/mol
Ionization energies710.2, 1620, 2747 kJ/mol (1st, 2nd, 3rd)
Molar heat capacity24.06 J/(mol·K)
Discovered byKarl Ernst Claus

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

Position in the periodic table

HydrogenHHeliumHeLithiumLiBerylliumBeBoronBCarbonCNitrogenNOxygenOFluorineFNeonNeSodiumNaMagnesiumMgAluminiumAlSiliconSiPhosphorusPSulfurSChlorineClArgonArPotassiumKCalciumCaScandiumScTitaniumTiVanadiumVChromiumCrManganeseMnIronFeCobaltCoNickelNiCopperCuZincZnGalliumGaGermaniumGeArsenicAsSeleniumSeBromineBrKryptonKrRubidiumRbStrontiumSrYttriumYZirconiumZrNiobiumNbMolybdenumMoTechnetiumTcRutheniumRuRhodiumRhPalladiumPdSilverAgCadmiumCdIndiumInTinSnAntimonySbTelluriumTeIodineIXenonXeCesiumCsBariumBaLanthanumLaCeriumCePraseodymiumPrNeodymiumNdPromethiumPmSamariumSmEuropiumEuGadoliniumGdTerbiumTbDysprosiumDyHolmiumHoErbiumErThuliumTmYtterbiumYbLutetiumLuHafniumHfTantalumTaTungstenWRheniumReOsmiumOsIridiumIrPlatinumPtGoldAuMercuryHgThalliumTlLeadPbBismuthBiPoloniumPoAstatineAtRadonRnFranciumFrRadiumRaActiniumAcThoriumThProtactiniumPaUraniumUNeptuniumNpPlutoniumPuAmericiumAmCuriumCmBerkeliumBkCaliforniumCfEinsteiniumEsFermiumFmMendeleviumMdNobeliumNoLawrenciumLrRutherfordiumRfDubniumDbSeaborgiumSgBohriumBhHassiumHsMeitneriumMtDarmstadtiumDsRoentgeniumRgCoperniciumCnNihoniumNhFleroviumFlMoscoviumMcLivermoriumLvTennessineTsOganessonOg

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Frequently asked questions

What is the atomic mass of ruthenium?

The atomic mass of ruthenium is 101.07 u, so one mole of ruthenium atoms weighs 101.07 g.

What is the electron configuration of ruthenium?

Ruthenium has 44 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d⁷, or [Kr] 4d⁷ 5s¹ in noble-gas notation. Electrons per shell: 2, 8, 18, 15, 1.

Is ruthenium a metal?

Yes. Ruthenium is a transition metal.

Where is ruthenium on the periodic table?

Ruthenium is in group 8, 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.