Atomic Properties
- Atomic Number
- 89
- Atomic Mass
- 227.0000 u
- Electron Configuration
- [Rn] 6d1 7s2
- Electronegativity
- 1.10
- Block
- f-block
- Group
- —
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1500.00 K
- Boiling Point
- 3500.00 K
- Density
- 10.0000 g/cm³
About Actinium
First actinide; highly radioactive; glows blue in the dark.
Isotopes of Actinium
Actinium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 227Ac | 227 | 227.0277523 | — | Radioactive |
Data source: NIH PubChem (aggregated from IUPAC, NIST)