Atomic Number (# of protons)

90

Mass (amu)

232.0

Density

11.7 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Rn]6d²7s²

Oxidation States (bold = most stable)

+4

Atomic Radius (pm)

180

Ionic Radius (pm)

(+4105

Electronegativity

1.1

Melting Point (⁰C, 1 atm)

1755

Electron Affinity (eV)

Not Available

Boiling Point(⁰C, 1 atm)

4788

1^st Ionization energy (eV)

6.08

Enthalpy of Fusion (kJ/mole)

15.65

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

543.9

3^rd Ionization Energy (eV)

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

0.11