Atomic Number (# of protons)

79

Mass (amu)

197.0

Density

19.3 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f¹⁴5d¹⁰6s¹

Oxidation States (bold = most stable)

+3,+1

Atomic Radius (pm)

144

Ionic Radius (pm)

(+3)85

Electronegativity

1.4

Melting Point (⁰C, 1 atm)

1064

Electron Affinity (eV)

2.31

Boiling Point(⁰C, 1 atm)

2857

1^st Ionization energy (eV)

9.23

Enthalpy of Fusion (kJ/mole)

12.55

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

324.4

3^rd Ionization Energy (eV)

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

0.13