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The elements Cr and Cu are exceptions because their configuration, if you write it out, has 4 and 9 electrons in the 3d orbital. However, since these are one electron away from forming half shells (5 electrons in the 3d orbital) and full shells (10 electrons in the 3d orbital), an electron is pulled from the 4s orbital to fill the shells.
Basing off the previous reply, it would be very difficult to have a symmetric orientation when we are one away from having a much more stable (5 or 10) configuration for the d block. Therefore, because of the increased stability one electron will enter the d block from the s block to make it more stable. Without this stability, we would likely not see many of the aspects of these two elements that we do as they are vital to how they behave.
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