We know that the Chromium has configuration 3d4 4s2 which then goes into 3d5 4s1 My question is that, the books usually represent the electron that goes from 4s into 3d as the one with +1/2 spin. But as 4s2 has one +1/2e- and-1/2e- in it, and conventionally the -1/2 electron goes into 3d5. Then why doesnot the electron that goes into 3d have the -1/2 spin(cause i have read it as +1/2 in some books.Means that -1/2 can change the spin multiplicity right...)

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    $\begingroup$ Cr doesn't have a "3d4 4s2 which goes to 3d5 4s1". It is simply 3d5 4s1 from the start. There is no electron going from 4s to 3d. $\endgroup$ – orthocresol Jul 12 at 17:30
  • $\begingroup$ THanks. I missed that point.. :) $\endgroup$ – Vibhav Jul 12 at 17:36

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