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Explain why chromium has only one electron in its 4s sub–shell? |
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Answer» the 4S electrons is moved to the 3d subshell because the element is more stable and has LOWER energy when the d is either half full or completely full. Copper does the same THING to have 10 electrons INSTEAD of 9 in the 3d subshell.This makes the configuration of Cr: [Ar]4s^1 3d^5And Cu is therefore: [Ar]4s^1 3d^10NB. Where [Ar] is the noble gas configuration up to that of Argon and ^ represents SUPERSCRIPT, to avoid confusion there. |
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