Protactinium
| Protactinium | |
|---|---|
| Pa | |
| In situ availability: | |
| Necessity: | |
| Atomic number: | 91 |
| Atomic mass: | 231.03588 |
| group: | 19 |
| period: | N/A |
| normal phase: | Solid |
| series: | Actinide |
| density: | 15.37 g/cm3 |
| melting point: | 1841K, 1568°C, 2854°F |
| boiling point: | |
| Ce ← Pr → Nd | |
| Th ← Pa → U | |
| N/A ← N/A → N/A | |
| Atomic radius (pm): | 180 |
| Bohr radius (pm): | |
| Covalent radius (pm): | |
| Van der Waals radius (pm): | |
| ionic radius (pm): | (+5) 78 |
| 1st ion potential (eV): | 5.89 |
| Electron Configuration | |
| 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d1 7s2 | |
| Electrons Per Shell | |
| 2, 8, 18, 32, 20, 9, 2 | |
| Electronegativity: | 1.5 |
| Electron Affinity: | - |
| Oxidation states: | 5, 4 |
| Magnetism: | ? |
| Crystal structure: | Tetragonal |
Protactinium is a Actinide metal.
It has a Tetragonal crystalline structure.
This element has no stable isotopes.
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