Chemical reactions of the elements Reaction of niobium with airNiobium does not react with air under normal conditions. The surface of niobium metal is protected by a thin oxide layer. Reaction of niobium with waterNiobium does not react with water under normal conditions. The surface of niobium metal is protected by a thin oxide layer. Reaction of niobium with the halogensNiobium does react with the halogens upon warming to form niobium(V) halides. So, niobium reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively niobium(V) bromide, NbF5, niobium(V) chloride, NbCl5, niobium(V) bromide, NbBr5, and niobium(V) iodide, NbI5. 2Nb(s) + 5F2(g) → NbF5(s) [white] 2Nb(s) + 5Cl2(g) → NbCl5(l) [yellow] 2Nb(s) + 5Br2(g) → NbBr5(s) [orange] 2Nb(s) + 5I2(g) → NbI5(s) [brass coloured] Reaction of niobium with acidsNiobium appears not to be attacked by many acids at room temperature but does dissolve in hydrofluoric acid, HF, or in a mixture of HF and nitric acid, HNO3. Reaction of niobium with basesNiobium metal is largely resistant to attack by molten alkali but will dissolve slowly. WebElements ShopWebElements now has an online shop at which you can buy periodic table posters, mugs, T-shirts, games, molecular models, and more.
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