Thulium
chemical element with the atomic number of 69 / From Wikipedia, the free encyclopedia
Thulium (pronounced /ˈθjuːliəm/) is a chemical element that has the symbol Tm and atomic number 69. It is a lanthanide element.
Thulium (pronounced /ˈθjuːliəm/) is a chemical element that has the symbol Tm and atomic number 69. It is a lanthanide element.