- Atomic Radius (Å)
Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt in the Earth's crust is found only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
27 Atomic Number
58.93 u Atomic Mass
1768.15 K Melting Point
3200 K Boiling Point
8.9 g/cm³ Density
1.7 Å Atomic Radius
1.26 Å Covalent Radius
1.88 Electronegativity
7.88 eV First Ionization Energy
63.9 Electron Affinity
4 Number of Shells
2, 8, 15, 2 Electron Shell Occupations
0.42 J/g Specific Heat