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| name |
Protactinium |
| latin |
Protactinium |
| french |
Protactinium |
| german |
Protactinium |
| symbol |
Pa |
| proton number |
91 |
| atomic weight |
231.03588 |
| Pauling electronegativity |
1.5 |
| electronic configuration |
[Rn] 5f26d17s2
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| melting point |
1841 K, 1568°C, 2854°F |
| boiling point |
- |
| group |
- |
| period |
7 |
| state (by 20°C) |
solid |
| oxidation states |
+4, +5 |
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discussion board
(1)
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Discoverer
| Year of discovery |
Discoverers |
| 1913 |
Otto Hahn (1879-1968)
Lise Meitner (1878-1968)
Frederick Soddy (1877-1956)
John Cranston |
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Czech version