Element: astatine |
Name : astatine |
Symbol : At |
Atomicnumber : 85 |
Relativeatomicmass : [ 210 ] (longest lived isotope) |
Standardstate : solid at 298 K |
Appearance : metallic |
Classification : Semi-metallic |
Groupinperiodictable : 17 |
Groupname : Halogen |
Periodinperiodictable : 6 |
Blockinperiodictable : p |
Shellstructure : 2.8.18.32.18.7 |
CASRegistry : 7440-68-8 |
Description : There are about 20 isotopes known, all of which are radioactive. |