Isotopes
Astatine has many isotopes, all of which are radioactive and none are naturally occurring.
| Isotope | Half-life |
| At196 | .3s |
| At197 | .35s |
| At198 | 5s |
| At199 | 7.1s |
| At200 | 43s |
| At201 | 1.48s |
| At202 | 3.02ms |
| At203 | 7.4ms |
| At204 | 9.1ms |
| At205 | 26ms |
| At206 | 29.9ms |
| At207 | 1.81h |
| At208 | 1.63h |
| At209 | 5.4h |
| At210 | 8.1h |
| At211 | 7.21h |
| At212 | .314s |
| At213 | .11ųs |
| At214 | .56ųs |
| At215 | .10ms |
| At216 | .30ms |
| At217 | 32ms |
| At218 | 1.6s |
| At219 | 50s |
| At220 | 3.17ms |