## Electron Transfer in Configurations

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

3045596722C
Posts: 15
Joined: Fri Sep 25, 2015 3:00 am

### Electron Transfer in Configurations

When writing electron configurations, are electrons from the s-level shell always transferred to the d-level (to get closer to a full 10-electron shell) because they have more energy? Or does it only happen when there are a certain number of electrons in the d-level? For instance, if the electron configuration for Ti is [Ar] 3d^2 4s^2, would the configuration become [Ar] 3d^4?

huanglejun
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

### Re: Electron Transfer in Configurations

No, the configuration won't be [Ar]3dˆ4, the 4s orbital has lower energy, so we should fill that orbital first.

Jacqueline Lee
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: Electron Transfer in Configurations

I believe we would put the s-orbital electron to the d-orbital when there is about to be 5 or 10 in the d-orbital.

That's why chromium's electron configuration is [Ar] 3d54s instead of [Ar]3d44s2
And copper's electrom configuration is [Ar]3d104s and not [Ar]3d94s2