Redirect Notice
The previous page is sending you to
https://www.quora.com/How-does-filling-4s-and-3d-orbitals-work-For-example-I-dont-understand-why-the-electron-configuration-for-Cu-is-4s1-3d10-instead-of-4s2-3d9
.
If you do not want to visit that page, you can
return to the previous page
.