Thulium, isiqalelo sama-69 kwitheyibhile yeperiodic. I-Thulium, eyona nto inomxholo omncinci wezinto zomhlaba ezinqabileyo, ubukhulu becala buhlala kunye nezinye izinto kwi-Gadolinite, i-Xenotime, i-ore emnyama enqabileyo yegolide kunye ne-monazite. I-Thulium kunye ne-lanthanide izinto zentsimbi zihlala ngokusondeleyo kwii-ore ezintsonkothe kakhulu kwi-nat...
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