Atomic Number (# of protons)

56

Mass (amu)

137.3

Density

3.5 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Xe]6s²

Oxidation States (bold = most stable)

+2

Atomic Radius (pm)

217

Ionic Radius (pm)

(+2)142

Electronegativity

1.0

Melting Point (⁰C, 1 atm)

729

Electron Affinity (eV)

0.15

Boiling Point(⁰C, 1 atm)

1805

1^st Ionization energy (eV)

5.21

Enthalpy of Fusion (kJ/mole)

7.66

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

140

3^rd Ionization Energy (eV)

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

0.20