f-orbitals

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janessadai 1F
Posts: 14
Joined: Fri Sep 28, 2018 12:18 am

f-orbitals

Postby janessadai 1F » Tue Oct 23, 2018 3:54 pm

I understand that (n+1)s orbital is filled before the nd orbital (ie 4s before 3d), but what about the f orbitals? When do the f orbitals get filled when we are determining electronic configuration (of Ba or Au for example)?

timschaeffer Dis 1J
Posts: 38
Joined: Fri Sep 28, 2018 12:18 am

Re: f-orbitals

Postby timschaeffer Dis 1J » Tue Oct 23, 2018 5:28 pm

Using the old high school chemistry diagonal rule, it looks like the 4f orbital just starts to get filled after 6s. This corresponds to everything after Lanthanum. The Lanthanoids (the top row of the purple box) show how the 4f orbital fills up from Cerium through to Lutetium.

With the scope of this course, we probably wont have to solve for the electron configurations of anything past the fourth period of the periodic table, which means that we probably wont have to deal with the f orbital.

Diagonal Rule.jpg

monikac4k
Posts: 56
Joined: Fri Sep 28, 2018 12:25 am

Re: f-orbitals

Postby monikac4k » Wed Oct 24, 2018 1:26 pm

Similarly to how Professor Lavelle describes the d-orbitals as lagging by 1 period, the f-orbitals lag by 2 periods. Just as the person before me stated, the 4f orbital is placed in the same period as the 6s orbital.


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