Term: thulium (Tm)
Literally meaning: “pertaining to Thoule land”
Origin
According Greek explorer Pytheas of Massalia (4 t6h cen BC) Thoule
was the northernmost habitable region of the world. Pytheas about 330 BC was
travelled to England and then to Thule where the night was very short (2-3
hours) and its north sea solid.
The name of element was given after Thule, the
region in the far north as Scandinavia land where the element had been found.
Coined/History
Thulium was found by Swedish
chemist Per Teodor Cleve in 1879 while trying to purify erbia (Er2O3) from
known impurities. He obtained finally two substances; one brown (oxide of
element holmium) and one green (oxide of
element thulium).
Definition
Thulium is a chemical element with atomic number 69 and atomic mass
168.93421. It is used in portable X-ray devices, in alloys with other rare
metals and in solid-state lasers.
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