Protactinium was discovered in 1917 by 3 independent teams of scientists. It is a radioactive
metal that is one of the rarest, most expensive elements. It can be found in uranium ores. Some
protactinium compounds are coloured, and both the element and its compounds are toxic.
- Atomic Number: 91
- Atomic Weight: 231.04
- Melting Point: <1600
- Boiling Point: not known
- Specific Gravity: 15.37
- Valences: 4 or 5
Webpages that Work! Zeuter Development Corporation
Post Office Box 225, Parry Sound, Ontario, CANADA P2A 2X3
Copyright © Zeuter Development Corporation, 1996-2022. All rights reserved.