Cobalt
Elemental State Co
Electron Configuration 1s22s22p63s23p64s23d7
First Ionization Potential 7.881 eV
Electron Affinity 0.662 eV
Z* 5.576 (Clementi-Raimondi)
Pauling Electronegativity 1.88
Covalent Radius 1.26 Å
Metallic Radius 1.25 Å
Ionic Radius 0.72 Å Co2+ coordination number = 4; high spin

0.81 Å Co2+ coordination number = 5

0.79 Å Co2+ coordination number = 6; low spin

0.885 Å Co2+ coordination number = 6; high spin

1.04 Å Co2+ coordination number = 8

0.685 Å Co3+ coordination number = 6; low spin

0.75 Å Co3+ coordination number = 6; high spin

van der Waal's Radius  
Melting Point 1495 oC
Boiling Point 2927 oC
Density 8.9 g/cm3
Other Properties