| Property | Value |
|---|---|
| Atomic number | 85 |
| Atomic weight | 209.9871 amu |
| Element family | Semi-metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Polonium |
| Next element | Radon |
| Density | 7 g/cm3 (STP) |
| Melting | 302 °C |
| Boiling | 337 °C |
| Covalent radius | 1.47 Å |
| Van der Waals radius | 2.02 Å |
| First ionization potential | 9.535 eV |
| Electron affinity | 2.416 eV |
| Electronegativity | 2.2 |
| Discovery year | 1940 |
| Sample reactions |
|---|
| Na + At = NaAt |
Astatine is an element number 85 from semi-metals family. Its symbol is At. Astatine atomic weight is 209.9871 amu. At has no stable or long lived isotopes. Astatine electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p5. Astatine density is 7 g/cm3 (STP). Astatine melting point is 302 °C. Astatine boiling point is 337 °C. Astatine covalent radius is 1.47 Å. Astatine van der waals radius is 2.02 Å. Astatine first ionization potential is 9.535 eV. Astatine first ionization potential is 2.416 eV. Astatine electronegativity by Pauling scale is 2.2. Astatine was discovered in 1940.
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