What is the electron configuration of cobalt?

Cobalt (Co), has an atomic number 27. it’s a D-block element …..so electrons are get added in 3d Sub Level Energy but first 4s orbital but 3d orbital …..is filled then. As per pauli’s exclusion principle, the electronic configuration is ……
1s^2 2s^2 2p^6 3s^2 3p^6 3d^7 4s^2
We can also write it as…
[Ar] 3d…

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