Actinium (Ac)
A fascinating actinide element.
Actinium is element 89 on the periodic table.
Element properties
- Atomic number
- 89
- Symbol
- Ac
- Atomic mass
- 227 u
- Category
- Actinide
- Period
- 7
- Group
- 3
- Block
- f
- State
- Solid
- Electron configuration
- [Rn] 6d1 7s2
- Electronegativity (Pauling)
- 1.1
- Density
- 10 g/cm³
- Melting point
- 1050 °C
- Boiling point
- 3198 °C