Thulium is a rare earth metal from the periodic table. It is a silvery-white, malleable metal that is relatively rare in nature. Thulium is used in some alloys, as well as in portable X-ray machines and portable X-ray generators. It is also used in some nuclear reactor control rods.
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| Atomic number | 69 |
| Group | VA |
| Period | 6 |
| Mass | 168.9342 |
| Latin name | Thulium |
| Electron configuration | [Xe]4f13 6s2 |
| Oxidation state | 0, 2, 3 |