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Why fo the elements of Cr and Cu have different electron configurations than the rest of the elements in the 3d block? For instance why is Cr's electron configuration: [Ar]3d^5 4s^1 instead of [Ar]3d^4 4s^2? What other elements are an exception to the expected electron configuration? Will we need to memorize these?
d^5 and d^10 are two states where the element is stable because the electrons fill up half the orbital or the full orbital. Atoms want to achieve this state, so d^4 and d^5 use an electron from the s orbital to get to the half/full d orbitals, resulting in s^1 instead of s^2
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