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Atomic Number : 69Atomic Symbol : TmAtomic Weight : 168.93421Melting Point : 2,813 F ( 1,545 C)Boiling Point : 3,542 F ( 1,950 light speed )
Word descent : Tm is named forThule , the earliest name for Scandinavia .
Ultrapure crystalline thulium, 22.3 grams. This piece is 2.5 by 3 centimeters.
find : This rare ground was discover by Sweedish chemist Per Teodor Cleve in 1879 .
Properties of atomic number 69
The soft and malleable silver - greyish component can be cut with a knife . The element has 25 screw isotope , with atomic masses ranging from 152 to 176 . Natural Tm is stable .
Sources of Tm
While it is the least abundant of all thelanthanides , or rare earthly concern elements , new source have been late discovered , putting it on par with cadmium , silver and gold in term of supplying .
Like other rarified dry land elements , thulium occurs in minuscule measure in a number of minerals . It is obtained commercially from monazite , which hold about 0.007 percent of the element .
Thulium can be isolated by reduction of the oxide withlanthanumby Ca reduction in a shut container .
Uses of atomic number 69
Because of the relatively high price of the metal , thulium has not yet found many pragmatic applications , but it has likely use as an energy informant . born thulium also has possible function ceramic magnetic material used in microwave equipment , and can be used for dope up vulcanized fiber lasers .
When bombarded in a nuclear nuclear reactor , atomic number 69 can be used as a radiation source in portable X - ray equipment .
As with other lanthanoid , thulium has a low - to - moderate acute toxic military rating , so careful treatment is necessary .
( Source : Los Alamos National Laboratory )
