Element: protactinium |
Name : protactinium |
Symbol : Pa |
Atomicnumber : 91 |
Relativeatomicmass : 231.03588 (2) |
Standardstate : solid at 298 K |
Appearance : silvery metallic |
Classification : Metallic |
Groupinperiodictable : None |
Groupname : Actinoid |
Periodinperiodictable : 7 (actinoid) |
Blockinperiodictable : f |
Shellstructure : 2.8.18.32.20.9.2 |
CASRegistry : 7440-13-3 |
Description : Protactinium has a bright metallic lustre which it retains for some time in air. The element is superconductive below 1.4 K. |