|Origin of Name||Named after Thule, ancient Scandinavia.|
|Discovery Credits||Discovered by P. T. Cleve at Uppsala, Sweden.|
|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.
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