d orbital or s orbital first?
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 25
- Joined: Fri Sep 29, 2017 7:06 am
d orbital or s orbital first?
When do you know when to begin the electron configuration with the d orbital instead of the s orbital first?
-
- Posts: 77
- Joined: Fri Sep 29, 2017 7:05 am
- Been upvoted: 2 times
Re: d orbital or s orbital first?
A d orbital with a lower n value will always go before an s orbital of a higher n value. For example, Titanium would be 3d^2 4s^2
-
- Posts: 59
- Joined: Fri Sep 29, 2017 7:06 am
-
- Posts: 20
- Joined: Fri Sep 29, 2017 7:04 am
Re: d orbital or s orbital first?
4s is lower in energy until there are e- in the 3d orbital (that's why you fill 4s first). Once there are e- in the 3d orbita,l the 4s orbital becomes higher in energy. What helped me understand this is the fact that once there are e- in the 3d orbital they provide "shielding" for the e- in the 4s orbital. Therefore you remove e- from the 4s orbital first when creating an ion.
-
- Posts: 50
- Joined: Sat Jul 22, 2017 3:01 am
Re: d orbital or s orbital first?
The way I remembered it is that s comes before d if d has no electrons; once it does, d always comes before s.
-
- Posts: 64
- Joined: Thu Jul 13, 2017 3:00 am
Re: d orbital or s orbital first?
Until you reach element 19 or 20, the S will generally come before d because it is in lower energy, once the d orbital starts to get filled up, it loses its energy and is less energy than the 4s orbital, for example, scandium would have the configuration of 3d13s2 if it was coming from Argon. Make sense?
Return to “Electron Configurations for Multi-Electron Atoms”
Who is online
Users browsing this forum: No registered users and 8 guests