89Ac
Actinium
Actinide
Properties of Actinium
- Atomic number (Z)
- 89
- Symbol
- Ac
- Name
- Actinium
- Atomic mass
- 227 u
- Period
- 7
- Group
- 3
- Family
- Actinides (f-block)
- Classification
- Actinide
- Electron configuration
- [Rn] 6d¹ 7s²
About Actinium
Actinium is a chemical element with symbol Ac and atomic number 89 (atomic mass of about 227 u). It is classified as a actinide on the periodic table.
On the periodic table, Actinium is located in period 7, in group 3, 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 Actinium is [Rn] 6d¹ 7s², which determines how it forms chemical bonds and takes part in reactions.