AP 关于核外电子排布
问题描述：
AP 关于核外电子排布
Provide the electron configurations for Cr and Cu then explain why we see a half filled d-shell for Cr and a fully filled d-shell for Cu even though there is an open s-orbital position available.
答
Cr [Ar]3d5 4s1
Cu [Ar]3d10 4s1
按照能级顺序正常的排布应该是Cr 3d4 4s2 Cu 3d9 4s2
解释这种现象的原因就是用轨道全满或者半满的能量比较低来进行解释.
Cr是3d半满能量比较低 Cu是3d全满能量比较低,所以4s都只排了一个电子.