27
Co
Cobalt
Cobalt
Cobalt (Co)
Transition Metals · Solid · Period 4 · Group 9
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Element Properties
- Atomic Number
- 27
- Symbol
- Co
- Atomic Mass
- 58.9332
- Category
- Transition Metals
- Standard State
- Solid
- Period
- 4
- Group
- 9
- Electronegativity
- 1.88
- Atomic Radius
- 192
- Ionization Energy
- 7.88
- Electron Affinity
- 0.66
- Oxidation States
- +3, +2
- Melting Point
- 1768 K (1494.85 °C)
- Boiling Point
- 3200 K (2926.85 °C)
- Density
- 8.86
- Electron Configuration
- [Ar]4s2 3d7
- Year Discovered
- 1735
Frequently asked questions
What is the atomic number of Cobalt?
The atomic number of Cobalt is 27, which equals the number of protons in its nucleus.
What is the atomic mass of Cobalt?
The atomic mass of Cobalt is approximately 58.9332 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Cobalt?
The electron configuration of Cobalt is [Ar]4s2 3d7.
Where is Cobalt in the periodic table?
Cobalt is located in period 4, group 9.
When was Cobalt discovered?
Cobalt was discovered in 1735.