Atomic Number (# of protons)

39

Mass (amu)

88.91

Density

4.50 g/cm³ (20⁰C, 1 atm)

Electron Configuration

[Kr]4d¹5s²

Oxidation States (bold = most stable)

+3

Atomic Radius (pm)

178

Ionic Radius (pm)

(+3)102

Electronegativity

1.1

Melting Point (⁰C, 1 atm)

1522

Electron Affinity (eV)

0.31

Boiling Point(⁰C, 1 atm)

3338

1^st Ionization energy (eV)

6.22

Enthalpy of Fusion (kJ/mole)

17.15

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

393

3^rd Ionization Energy (eV)

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

0.30