 |
| Name |
thulium |
| Symbol |
Tm |
| Atomic Weight |
168.93421 |
| Atomic Number |
69 |
| CAS ID |
7440-30-4 |
| Group Number |
|
| Group Name |
Lanthanoid |
| Period Number |
6 |
| Origin of Name |
Named after Thule, ancient Scandinavia. |
| Year Discovered |
1879 |
| Discovery Credits |
Discovered by P. T. Cleve at Uppsala, Sweden. |
| Class |
Metallic |
| Color |
Silvery White |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Silvery metal, rarest of the lanthanide group. Tarnishes in air and
reacts with water. Few uses but some employed as a radiation source in portable x-ray equipment. Diagnostic tests:
There are no simple diagnostic tests to identify thulium.
X-ray fluorescence spectroscopy is commonly employed to identify and
analyze members of the Rare-Earth group elements.
|
Back to Elements Table Page
| |
