Which of the following elements has a ground state electron configuration different from the predicted one
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Which of the following elements has a ground state electron configuration different from the predicted one

[From: ] [author: ] [Date: 12-09-20] [Hit: ]
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i know it is Cu, but why? PLEASE HELP ASAP

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Cu is: 1s2 2s2 2p6 3s2 3p6 4s1 3d10

instead of being 4s2 and electron is borrowed to complete the d suborbital - a full d suborbital is very stable
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