Protactinium
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| Protactinium | |
|---|---|
| Properties | |
| Atomic symbol | Pa |
| Atomic number | 91 |
| Classification | Metallic |
| Atomic mass | 231.03588 amu |
| Other Information | |
| Date of discovery | 1913 |
| Name of discoverer | Kasimir Fajans and O.H. Göhring |
| Name origin | From the Greek Protos meaning first. |
| Uses | None |
| Obtained from | Occurs in minute trace amounts in uranium ores, but chiefly amongst the fission products of uranium, thorium, and plutonium. In 1961 the UK Atomic Energy Authority produced 125g of pure protactinium from uranium fuel elements, which represents the major world stock of protactinium. |