Chemical reactions of the elements Reaction of europium with airEuropium metal tarnishes slowly in air and burns readily to form europium (III) oxide, Eu2O3. 4Eu + 3O2 → 2Eu2O3 Reaction of europium with waterThe silvery white metal europium is quite electropositive and reacts slowly with cold water and quite quickly with hot water to form europium hydroxide, Eu(OH)3, and hydrogen gas (H2). 2Eu(s) + 6H2O(g) → 2Eu(OH)3(aq) + 3H2(g) Reaction of europium with the halogensEuropium metal reacts with all the halogens to form europium(III) halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively europium(III) bromide, EuF3, europium(III) chloride, EuCl3, europium(III) bromide, EuBr3, and europium(III) iodide, EuI3. There are question marks regarding the existence of europium(III) iodide. 2Eu(s) + 3F2(g) → 2EuF3(s) [white] 2Eu(s) + 3Cl2(g) → 2EuCl3(s) [yellow] 2Eu(s) + 3Br2(g) → 2EuBr3(s) [grey] 2Eu(s) + 3I2(g) → 2EuI3(s) [?] Reaction of europium with acidsEuropium metal dissolves readily in dilute sulphuric acid to form solutions containing the very pale pink aquated Eu(III) ion together with hydrogen gas, H2. It is quite likely that Eu3+(aq) exists as largely the complex ion [Eu(OH2)9]3+ 2Eu(s) + 3H2SO4(aq) → 2Eu3+(aq) + 3SO42-(aq) + 3H2(g) Reaction of europium with basesWebElements 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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Europium
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