Cobalt
Transition Metal
Cobalt (Co) is a chemical element with atomic number 27, classified as a transition metal. At room temperature it is a solid. It was discovered in 1735 by Georg Brandt.
Properties
- Atomic number
- 27
- Atomic mass
- 58.933 u
- Category
- Transition Metal
- Group
- 9
- Period
- 4
- Block
- d-block
- Electron configuration
- [Ar] 3d⁷ 4s²
- Phase at STP
- Solid
- Density
- 8.86 g/cm³
- Melting point
- 1768 K (1494.8 °C)
- Boiling point
- 3200 K (2926.8 °C)
- Electronegativity
- 1.88
- Atomic radius
- 152 pm
- Ionization energy
- 7.881 eV
- Discovery
- 1735 · Georg Brandt
Common uses
Batteries, magnets, blue pigments, medical implants
Did you know?
Critical for lithium-ion batteries and creates brilliant blue glass.