| Element (Atom) Name | Astatine |
| Symbol | At |
| Physical state at room temperature | Solid |
| Element Classification | Semi-metal |
| Group Name | Halogen |
| Period Number (Periodic table) | 6 |
| Group number (Periodic table) | 17 |
| Atomic number | 85 |
| Atomic weight | 210 (Ref: Jlab-ele085, Lanl-85, Nist-85) |
| Atomic Radius | 202 pm (Van der Waals) (Ref: Lanl-85) |
| Density | ≈7 g/cm3 (Ref: Jlab-ele085) |
| Melting point | 302°C (Ref: Jlab-ele085) |
| Boiling point | 337 °C (Ref: Lanl-85) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p5 |
| Oxidation States | 7, 5, 3, 1, -1 (Ref: Lanl-85) |
| Ionization Energy | 9.5 eV (Ref: Jlab-ele085) 9.31751 eV (Ref: Nist-85) |
| Number of Stable Isotopes | 0 |
| InChI | InChI=1S/At (Ref: Pubchem-85) |
| InChI Key | RYXHOMYVWAEKHL-UHFFFAOYSA-N (Ref: Pubchem-85) |
| Remarks | Radioactive |
REFERENCES
- Jlab-ele085: https://education.jlab.org/itselemental/ele085.html
- Lanl-85: https://periodic.lanl.gov/85.shtml
- ciaaw-atomic-weights: https://www.ciaaw.org/atomic-weights.htm
- Nist-85: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=85
- Pubchem-85: https://pubchem.ncbi.nlm.nih.gov/element/85
- science.co.il: https://www.science.co.il/elements/
