Atomic Number (# of protons)

70

Mass (amu)

173.0

Density

6.90 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f¹⁴6s²

Oxidation States (bold = most stable)

+3,+2

Atomic Radius (pm)

194

Ionic Radius (pm)

(+3)99

Electronegativity

1.1

Melting Point (⁰C, 1 atm)

819

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

1196

1^st Ionization energy (eV)

6.25

Enthalpy of Fusion (kJ/mole)

7.66

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

128.9

3^rd Ionization Energy (eV)

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

0.16