Pa
Protactinium
91
Atomic Number: 91
Atomic mass: 231.035882
Ionization energy: 568
Electronaffinity:
Covalent radius:
Calculated radius:
Empirical radius: 180
Vanderwaals radius:
Electronegativity: 1.5
Density: 15.37
Oxidation states: 3, 4, 5
Melting point: 1845
Boiling point: 4273
Electron configuration: [Rn] 5f2 6d1 7s2
Element group: 6
Element period: 9

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