Element: radium |
Name : radium |
Symbol : Ra |
Atomicnumber : 88 |
Relativeatomicmass : [ 226 ] (longest lived isotope) |
Standardstate : solid at 298 K |
Appearance : metallic |
Classification : Metallic |
Groupinperiodictable : 2 |
Groupname : Alkaline earth metal |
Periodinperiodictable : 7 |
Blockinperiodictable : s |
Shellstructure : 2.8.18.32.18.8.2 |
CASRegistry : 7440-14-4 |
Description : Pure metallic radium is brilliant white when freshly prepared, but blackens on exposure to air, probably due to formation of the nitride. |