Thulium

Symbol

Tm

Atomic number

69

Atomic mass	168.934		Thermal conductivity	0.168
Atomic radius	2.42		Covalent radius	1.56
Density	9.33		Atomic volume	18.1
Melting point	1818		Oxidation states	3,2
Boiling point	2220		Stable isotopes	1
Heat of vapor.	191		Electronegativity	1.25
Heat of fusion	16.84		First ionization	6.184
Specific heat	0.16		Electrical conduct.	...

Electron configuration

Thulium

As a member of the fourteen member lanthanide series, this element has few properties which distinguish it from the other members of the series. All of them along with lanthanum, yttrium, and scandium occur in very small quantities in nature. The usual source is the mineral monazite, or monazite sand, which is a mixture of phosphates containing also some thorium phosphate.

Thulium Nuclear Data