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Unformatted text preview: For elements at the end of the s or p block, the HOAO will be in the subshell corresponding to the subblock, but because this subshell is filled the LUAO will be in the next subshell. For example, argon is at the end of the p block. The ground-state configuration of an argon atom is [Ne]3s 2 3p 6 . Therefore the HOAO is in the 3p subshell, but because this subshell is filled the LUAO is in the next subshell, the 4s . For d-block elements the HOAO is also not usually in the same subshell as the LUAO. Electrons will usually be removed from the higher-energy s subshell but added to either the d subshell, if it's unfilled, or to the next p subshell, if the d subshell is filled. For example, iron is in the middle of the d block. The ground-state configuration of an iron atom is [Ar]3d 6 4s 2 . Therefore the HOAO is in the 4s subshell, but the LUAO is in the unfilled 3d subshell....
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