Atomic Number (# of protons)

71

Mass (amu)

175.0

Density

9.84 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f¹⁴5d¹6s²

Oxidation States (bold = most stable)

+3

Atomic Radius (pm)

172

Ionic Radius (pm)

(+3)98

Electronegativity

1.1

Melting Point (⁰C, 1 atm)

1663

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

3402

1^st Ionization energy (eV)

5.43

Enthalpy of Fusion (kJ/mole)

18.7

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

355.9

3^rd Ionization Energy (eV)

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

0.15