| Thulium [Tm] (CAS-ID: 7440-30-4) | |
| An: 69 N: 100 Am: 168.93421 | |
| Group Name: Lanthanoid | |
| Block: f-block Period: 6 (lanthanoid) | |
| State: solid at 298 K | |
| Colour: silvery white Classification: Metallic | |
| Boiling Point: 2223K (1950'C) | |
| Melting Point: 1818K (1545'C) | |
| Density: 9.32g/cm3 | |
 Discovery Information |
| Who: Per Theodor Cleve |
| When: 1879 |
| Where: Sweden |
| Name Origin |
| From Thule ancient name of Scandinavia. |
| Sources |
| Found with other rare earths in the minerals; monazite, gadolinite, euxenite, xenotime, and others. |
| Uses |
| None of thulium's compounds is commercially important. Radioactive thulium is used to power portable x-ray machines, eliminating the need for electrical equipment. |
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