Thulium reacts with various metallic and non-metallic elements forming a range of binary compounds, including TmN, TmS, TmC 2, Tm 2C 3, TmH 2, TmH 3, TmSi 2, TmGe 3, TmB 4, TmB 6 and TmB 12. [ citation needed] In those compounds, thulium exhibits valence states +2 and +3, however, the +3 state is
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