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Cu is the other unique element. A completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital. Their electron configurations are - Cr: [Ar] 3d54s1 and Cu: [Ar]3d104s1
The two elements that have exceptions are Cr and Cu, but those aren't the only ones. Some of the elements below them in the column may also have the same exception. Writing out the electron configuration will help.
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