Protactinium

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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:
CePrNd
Th ← Pa → U
N/AN/AN/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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