Thulium silih tunggil datu kimia antuk simbolTm miwah wilangan atom 69. Puniki datu kaping tigang welas miwah kaping tiga saking untat ring bacakan lantanida, paindikan oksidasi sané pinih ketah punika +3, kacingak ring oksida, halida, miwah senyawa liyanan; mawinan sanget belad ring bacakan punika, asapunika, paindikan oksidasi +2 taler kategtegang olih kulit 4f sané nagih penuh. Larutan MCIn, sekadi senyawa lantanida untat liyanan, senyawa thulium larut ngawentuk kompléks koordinasi sareng sia molekul toya.
↑Yttrium and all lanthanides except Ce and Pm have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017. and Arnold, Polly L.; Petrukhina, Marina A.; Bochenkov, Vladimir E.; Shabatina, Tatyana I.; Zagorskii, Vyacheslav V.; Cloke (2003-12-15). "Arene complexation of Sm, Eu, Tm and Yb atoms: a variable temperature spectroscopic investigation". Journal of Organometallic Chemistry. 688 (1–2): 49–55. doi:10.1016/j.jorganchem.2003.08.028.