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The electronic configuration of cobalt is :1s2 2s2 2p6 3s2 3p6 3d7 4s2
This is so because cobalt has an atomic no of 27. So it will have 27 electrons. The 1st shell can accommodate a maximum of 2 electrons, the 2nd shell can accomodate 8. So that makes it 10, 17 to go.
Now the 3s and 3p subshells get filled up with 2 and 6 electrons respectively, but after that instead of the 3d subshell, the 4s subshell gets filled up.(This is so because the 4s subshell has a lower energy level than 3d).So that makes it 20 electrons. The remaining 7 proceed into the 3d subshell to make a total of 27.
The complete electron configuration for cobalt (Co) is 1s2 2s2 2p6 3s2 3p6 3d7 4s2. This corresponds to a total of 27 electrons in the atom of cobalt.
The element cobalt has atomic number 27 and the electron configuration
[Ar]3d74s2
Z (atomic number) = 27 Cobalt Co
1s2 2s2 2p6 3s2 3p6 4s2 3d7 or
[Ar] 4s2 3d7
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Chemical reactivity of an atom is determined by?
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About the electron configuration?
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