| Element (Atom) Name | Actinium |
| Symbol | Ac |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Actinide |
| Period Number (Periodic table) | 7 |
| Group number (Periodic table) | None |
| Atomic number | 89 |
| Atomic weight | 227 (Ref: Jlab-ele089, Lanl-89, Nist-89) |
| Atomic Radius | 260 pm (Van der Waals) (Ref: Lanl-89) |
| Density | 10.07 g/cm3 (Ref: Jlab-ele089) |
| Melting point | 1051°C (Ref: Jlab-ele089) 1227 °C (Ref: Lanl-89) |
| Boiling point | 3198°C (Ref: Jlab-ele089, Lanl-89) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 7s2 |
| Oxidation States | +3 (Ref: Jlab-ele089) 3, 2 (Ref: Lanl-89) |
| Ionization Energy | 5.17 eV (Ref: Jlab-ele089) 5.380226 eV (Ref: Nist-89) |
| Number of Stable Isotopes | 0 |
| InChI | InChI=1S/Ac (Ref: Pubchem-89) |
| InChI Key | QQINRWTZWGJFDB-UHFFFAOYSA-N (Ref: Pubchem-89) |
| Remarks | Radioactive |
REFERENCES
- Jlab-ele089: https://education.jlab.org/itselemental/ele089.html
- Lanl-89: https://periodic.lanl.gov/89.shtml
- ciaaw-atomic-weights: https://www.ciaaw.org/atomic-weights.htm
- Nist-89: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=89
- Pubchem-89: https://pubchem.ncbi.nlm.nih.gov/element/89
- science.co.il: https://www.science.co.il/elements/
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