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It is believed that the half filled d subshell and half filled s subshell is a more stable configuration than when the s is completely filled but the d shell only has 4 electrons since having a half filled subshell increases stability.
In addition to what everyone else has stated, the half filled d subshell in chromium and completely filled d subshell in copper are more stable configurations because they have comparatively lower energies than [Ar] 3d^5 4s^1 and [Ar] 3d^9 4s^2. I believe this is affected by Hund's rule as well; "each orbital of the subshells are occupied singly with electrons before double occupation occurs, in order to maximize the total spin quantum number for the electrons in the open subshells."
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