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background Key data; description History hydrogen around us Uses Geology Biology hydrogen compounds Reactions of hydrogen Compounds Bond enthalpies Radii in compounds Lattice energies Reduction potentials nuclear properties NMR Naturally occurring isotopes Radioisotopes electronic properties Electronic configuration Ionization energies Electron affinities Electronegativities Effective nuclear charges Electron binding energies Atom radii Valence shell radii physical properties Bulk properties (density, resistivity, etc.) Thermal properties (melting point, etc.) Thermodynamic properties crystallography Crystal structure Elements NIOBIUM 41 Nb 92.90638 (2) actiniumaluminiumamericiumantimonyargonarsenicastatinebariumberkeliumberylliumbismuthbohriumboronbrominecadmiumcaesiumcalciumcaliforniumcarbonceriumchlorinechromiumcobaltcoppercuriumdarmstadtiumdubniumdysprosiumeinsteiniumerbiumeuropiumfermiumfluorinefranciumgadoliniumgalliumgermaniumgoldhafniumhassiumheliumholmiumhydrogenindiumiodineiridiumironkryptonlanthanumlawrenciumleadlithiumlutetiummagnesiummanganesemeitneriummendeleviummercurymolybdenumneodymiumneonneptuniumnickelniobiumnitrogennobeliumosmiumoxygenpalladiumphosphorusplatinumplutoniumpoloniumpotassiumpraseodymiumpromethiumprotactiniumradiumradonrheniumrhodiumroentgeniumrubidiumrutheniumrutherfordiumsamariumscandiumseaborgiumseleniumsiliconsilversodiumstrontiumsulphurtantalumtechnetiumtelluriumterbiumthalliumthoriumthuliumtintitaniumtungstenuraniumvanadiumxenonytterbiumyttriumzinczirconium Name: niobium Group number: 5 Symbol: Nb Group name: (none) Atomic number: 41 Period number: 5 Atomic weight: 92.90638 (2) Block: d-block CAS Registry ID: 7440-03-1 Voice: Standard state: solid at 298 K Colour: grey metallic Classification: Metallic Availability: niobium is available in many forms inclu Fluorides NbF3 NbF4 [NbF5]4 Chlorides NbCl3 NbCl4 NbCl5 Bromides NbBr3 NbBr4 NbBr5 Iodides NbI3 NbI4 NbI5 Hydrides none listed Oxides NbO NbO2 Nb2O5 Sulfides NbS2 Selenides NbSe2 Tellurides NbTe2 Nitrides NbN

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