The Periodic Table/69 - Thulium (Tm)

Element Thulium (Tm, 69)

Here you can read more about the chemical element Thulium. Its shemical symbol is Tm and its atomic number is 69. The relative atomic mass of Thulium is 168.93421 u. The elemental classification of Thulium is Lanthanides, and it belongs to group 3 and period 6 in the Periodic Table of Elements.

The density of Thulium is 9321 kg/m3. The melting point of Thulium is 1818 Kelvin (1545 ℃). The boiling point of Thulium is 2220 Kelvin (1947 ℃). Thulium was discovered in the year 1879 by Per Teodor Cleve.

To the right (or below if you are using a mobile device with a smaller screen) you will find the information given above for the element Thulium ordered in tabular form, which might be easier to read and use if you want to quantify it in some sort.

Data about element Thulium

Chemical symbol
Element classification
Atomic number
Relativ atomic mass
Atomic mass
168.93421 u
9321 kg/m3
Melting point
1818 K   (1545 ℃)
Boiling point
2220 K   (1947 ℃)
Discovered year
Discovered by
Per Teodor Cleve