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In page Thulium:

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Thulium reacts with various metallic and non-metallic elements forming a range of binary compounds, including TmN, TmS, TmC2, Tm2C3, TmH2, TmH3, TmSi2, TmGe3, TmB4, TmB6 and TmB12.[citation needed] Like most lanthanides, the +3 state is most common and is the only state observed in thulium solutions.[4] Thulium exists as a Tm3+ ion in solution. In this state, the thulium ion is surrounded by nine molecules of water.[5] Tm3+ ions exhibit a bright blue luminescence.[5] Because it occurs late in the series, the +2 oxidation state can also exist, stabilized by the nearly full 4f electron shell, but occurs only in solids.[citation needed]