[填空题]
Cu is a transition metal commonly uyxx77:nz5ml gsed in wi1p)u4qrtc(g3h u p:pires.
1.Determine the complete electron configuration of Cu. $s^2$ $s^2$ $p^6$ $s^2$ $p^6$ $d^{10}$ $s^1$
2.State the condensed electron configuration of $Cu^+$. $3d^{10}$
3.Determine whether the electron configuration of Cu follows the usual rules of electron configuration.
