Periodic Table of the Elements
Chemical & Physical Properties of Protactinium
Protactinium
| Latin name | Protaktinium |
| English name | Protactinium |
| chemical smybol | Pa |
| atomic number | 91 |
| relative atomic mass | 231,03588 |
| period | 7 |
| group | V.B |
| classification | actinides |
| discovery year | 1913 |
| discoverer | Fajans, Gohring |
| melting point [°C] | 1572 |
| boiling point [°C] | ˜4000 |
| density [g cm-3] | 15,4 |
| electronegativity [Pauling] | 1,5 |
| oxidation states | IV, V |
| electron configuration | [Rn]5f2 6d1 7s2 |
| specific heat [J g-1K-1] | 0,12 |
| heat of fusion [kJ mol-1] | 12,3 |
| 1. ionizing potential [eV] | 5,89 |
| state at normal conditions | solid |
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