The electron configuration for a neutral atom of cobalt is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷.
Cobalt [tex]Co \limits^{58.93}_{27}[/tex] have
- Mass number = 58.93
- Atomic number = 27
- Proton = electron = 27
The electron configuration is the distribution of electrons from the lowest energy level according to the Aufbau principle. From the lowest energy level 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, ...
The numbers in the exponents indicate the maximum number of electrons that can holds.
₂₇ Co : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
Before 3d, there were already 20 electrons, so in 3d there are only 7 left. 5 atoms are shown with up arrows and 2 down arrows because we must fill, up arrows first.
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