69Tm
Thulium
Lanthanide
Properties of Thulium
- Atomic number (Z)
- 69
- Symbol
- Tm
- Name
- Thulium
- Atomic mass
- 168.934 u
- Period
- 6
- Group
- —
- Family
- Lanthanides (f-block)
- Classification
- Lanthanide
- Electron configuration
- [Xe] 4f¹³ 6s²
About Thulium
Thulium is a chemical element with symbol Tm and atomic number 69 (atomic mass of about 168.934 u). It is classified as a lanthanide on the periodic table.
On the periodic table, Thulium is located in period 6, outside the numbered groups (f-block), belonging to the lanthanides (f-block) family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Thulium is [Xe] 4f¹³ 6s², which determines how it forms chemical bonds and takes part in reactions.