| Property | Value |
|---|---|
| Atomic number | 89 |
| Atomic weight | 227.0278 amu |
| Element family | Transition metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Radium |
| Next element | Thorium |
| Density | 10.07 g/cm3 (STP) |
| Melting | 1050 °C |
| Boiling | 3197 °C |
| Covalent radius | 1.86 Å |
| Ionic radius | 1.119 Å |
| First ionization potential | 5.172 eV |
| Electron affinity | 0.350 eV |
| Electronegativity | 1.1 |
| Discovery year | 1902 |
Actinium is an element number 89 from transition metals family. Its symbol is Ac. Actinium atomic weight is 227.0278 amu. Ac has no stable or long lived isotopes. Actinium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d1. Sample compounds that contain Actinium are Ac2O, NaAc, NaOAc, HOAc, KOAc, HAc.
Please let us know how we can improve this web app.
