Atomic Number (# of protons)

80

Mass (amu)

200.6

Density

13.55 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]4f¹⁴5d¹⁰6s²

Oxidation States (bold = most stable)

+2,+1

Atomic Radius (pm)

150

Ionic Radius (pm)

(+2)102

Electronegativity

1.4

Melting Point (⁰C, 1 atm)

-39

Electron Affinity (eV)

Not Stable

Boiling Point(⁰C, 1 atm)

357

1^st Ionization energy (eV)

10.44

Enthalpy of Fusion (kJ/mole)

2.29

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

56.9

3^rd Ionization Energy (eV)

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

0.14