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The for cobalt (Co) is ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7##, determined by the position of the element on .
Cobalt is an will end in a d block. Cobalt is in the 7th column of the d block and therefore has 7 d electrons ##d^7##. The element cobalt can be found in the 4th row or 4th energy level of the periodic table. However, the inner transition metals or d block are always one level lower than the energy level that the element is found on meaning the electron configuration for cobalt must end as ##3d^7##.
All electron levels must be filled above that point. So the entire configuration is as follows:
##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7##
As another example, Argon is a noble gas and has each of the electron levels filled. Using you can write the s,p,d,f configuration in an abbreviated form.
[Ar] can represent ##1s^2 2s^2 2p^6 3s^2 3p^6 ##
Making the configuration:
[Ar] ##4s^2 3d^7##
Here is a You Tube video on determining electron configurations:
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