Atomic Number (# of protons)

82

Mass (amu)

207.2

Density

11.4 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f¹⁴5d¹⁰6s²p²

Oxidation States (bold = most stable)

+4,+2

Atomic Radius (pm)

175

Ionic Radius (pm)

(+2)119

Electronegativity

1.6

Melting Point (⁰C, 1 atm)

328

Electron Affinity (eV)

0.36

Boiling Point(⁰C, 1 atm)

1750

1^st Ionization energy (eV)

7.42

Enthalpy of Fusion (kJ/mole)

4.77

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

179.2

3^rd Ionization Energy (eV)

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

0.13