electron configuration order

Moderators: Chem_Mod, Chem_Admin

Posts: 50
Joined: Wed Sep 18, 2019 12:19 am

electron configuration order

Postby NHolmes3L » Sun Oct 27, 2019 10:09 pm

does 4f or 5s come first?

Akshay Chellappa 1H
Posts: 59
Joined: Wed Sep 11, 2019 12:15 am

Re: electron configuration order

Postby Akshay Chellappa 1H » Sun Oct 27, 2019 10:11 pm

I believe that 5s is filled before 4f.

Nicholas Chin 1G
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: electron configuration order

Postby Nicholas Chin 1G » Sun Oct 27, 2019 10:12 pm

So just like the d-orbital and s-orbital, the 5s comes first, but after 2 electrons are in the 5s the 4f is actually placed before when you're writing out the electron configuration. You don't really need to worry about it because he said we wouldn't be tested on it.

Posts: 99
Joined: Sat Sep 14, 2019 12:17 am

Re: electron configuration order

Postby SimranSangha4I » Sun Oct 27, 2019 10:13 pm


Kendra Barreras 3E
Posts: 51
Joined: Mon Sep 23, 2019 12:16 am

Re: electron configuration order

Postby Kendra Barreras 3E » Sun Oct 27, 2019 10:14 pm

5s comes before, but don't worry too much about the f-block since Dr. Lavelle stated in lecture that we wouldn't really be dealing with it.

Sarah Nichols 4C
Posts: 52
Joined: Sat Aug 24, 2019 12:18 am

Re: electron configuration order

Postby Sarah Nichols 4C » Sun Oct 27, 2019 10:16 pm

5s will be filled before 4f

Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

Re: electron configuration order

Postby Chem_Mod » Sun Oct 27, 2019 10:18 pm

5s orbitals are always filled before 4d orbitals since they are lower in energy even though they have a higher principal quantum number. Similarly, 6s orbitals are lower in energy than 5d orbitals, so 6s orbitals are always filled up first. 5s, 5p, and 6s orbitals are all lower in energy than 4f orbitals. In other words, to get an electron in the 4f orbital, you must fill up the 5s orbitals, 5p orbitals, and 6s orbitals first.

Return to “Ionic & Covalent Bonds”

Who is online

Users browsing this forum: No registered users and 4 guests