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thulium
(redirected from atomic number 69)

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thulium

Soft, silver-white, malleable and ductile, metallic element of the lanthanide series, atomic number 69, relative atomic mass 168.94. It is the least abundant of the rare earth metals, and was first found in gadolinite and various other minerals. It is used in arc lighting.

The X-ray-emitting isotope Tm-170 is used in portable X-ray units. Thulium was named by Swedish chemist Per Cleve in 1879 after the northland, Thule.



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