90Th
Thorium
Actinide
Properties of Thorium
- Atomic number (Z)
- 90
- Symbol
- Th
- Name
- Thorium
- Atomic mass
- 232.038 u
- Period
- 7
- Group
- —
- Family
- Actinides (f-block)
- Classification
- Actinide
- Electron configuration
- [Rn] 6d² 7s²
About Thorium
Thorium is a chemical element with symbol Th and atomic number 90 (atomic mass of about 232.038 u). It is classified as a actinide on the periodic table.
On the periodic table, Thorium is located in period 7, outside the numbered groups (f-block), belonging to the actinides (f-block) family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Thorium is [Rn] 6d² 7s², which determines how it forms chemical bonds and takes part in reactions.