Atomic Number (# of protons)

93

Mass (amu)

237.0

Density

20.3 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Rn]5f⁴6d¹7s²

Oxidation States (bold = most stable)

+6,+5,+4,+3

Atomic Radius (pm)

Not Available

Ionic Radius (pm)

(+5)-

Electronegativity

1.2

Melting Point (⁰C, 1 atm)

639

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

3230

1^st Ionization energy (eV)

6.27

Enthalpy of Fusion (kJ/mole)

3.2

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

Not Available

3^rd Ionization Energy (eV)

Specific Heat Capacity ( J/ (g K), 25⁰C, 1 atm)

0.12