Atomic Number (# of protons)

92

Mass (amu)

238.0

Density

18.95 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Rn]5f³6d¹7s²

Oxidation States (bold = most stable)

+6,+5,+4,+3

Atomic Radius (pm)

139

Ionic Radius (pm)

(+6)81

Electronegativity

1.2

Melting Point (⁰C, 1 atm)

1135

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

3902

1^st Ionization energy (eV)

6.19

Enthalpy of Fusion (kJ/mole)

15.48

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

477.0

3^rd Ionization Energy (eV)

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

0.116