Chemical reactions of the elementsReaction of samarium with airSamarium metal tarnishes slowly in air and burns readily to form samarium (III) oxide, Sm2O3. 4Sm + 3O2 → 2Sm2O3 Reaction of samarium with waterThe silvery white metal samarium is quite electropositive and reacts slowly with cold water and quite quickly with hot water to form samarium hydroxide, Sm(OH)3, and hydrogen gas (H2). 2Sm(s) + 6H2O(g) → 2Sm(OH)3(aq) + 3H2(g) Reaction of samarium with the halogensSamarium metal reacts with all the halogens to form samarium(III) halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively samarium(III) bromide, SmF3, samarium(III) chloride, SmCl3, samarium(III) bromide, SmBr3, and samarium(III) iodide, SmI3. 2Sm(s) + 3F2(g) → 2SmF3(s) [white] 2Sm(s) + 3Cl2(g) → 2SmCl3(s) [yellow] 2Sm(s) + 3Br2(g) → 2SmBr3(s) [yellow] 2Sm(s) + 3I2(g) → 2SmI3(s) [orange] Reaction of samarium with acidsSamarium metal dissolves readily in dilute sulphuric acid to form solutions containing the yellow aquated Sm(III) ion together with hydrogen gas, H2. It is quite likely that Sm3+(aq) exists as largely the complex ion [Sm(OH2)9]3+ 2Sm(s) + 3H2SO4(aq) → 2Sm3+(aq) + 3SO42-(aq) + 3H2(g) Reaction of samarium with basesWebElements ShopWebElements now has a WebElements shop at which you can buy periodic table posters, mugs, T-shirts, games, molecular models, and more.
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Samarium
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