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Dang Lam
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Joined: Thu Jul 27, 2017 2:01 am


Postby Dang Lam » Wed Oct 25, 2017 8:35 pm

Does anyone know when does the "f-orbital"start and can you give an example? thanks

Maddie Hong 1I
Posts: 21
Joined: Fri Sep 29, 2017 6:04 am

Re: f-orbitals

Postby Maddie Hong 1I » Wed Oct 25, 2017 8:47 pm

The f-orbital starts with element 57, since the f-block is the lanthanides and actinides. For example, the electron configuration of La (lanthanum) is [Xe] 5d^1 6s^2. The electron configuration for Hf (hafnium) is [Xe] 4f^14 5d^2 6s^2

Hope this helps!

Yashaswi Dis 1K
Posts: 56
Joined: Fri Sep 29, 2017 6:04 am

Re: f-orbitals

Postby Yashaswi Dis 1K » Wed Oct 25, 2017 9:03 pm

The f-orbitals start with the lanthanides and the actinides, in the n=6 row and the f-orbitals have an n=4 as the principle quantum energy number. Specifically, the f-orbitals start with the element 58. n=4 is the energy level, b/c I believe it's in a lower energy state than the d-orbitals, which is lower than the s-orbitals. Hope this helps!

William Lan 2l
Posts: 73
Joined: Fri Sep 29, 2017 6:07 am

Re: f-orbitals

Postby William Lan 2l » Wed Oct 25, 2017 9:38 pm

Keep in mind that the f-orbitals (Lanthanides and Actinides) are on the bottom of the periodic table since there are so many that it can't find on the periodic table. So, starting element 57, look at the bottom of the periodic table (Lanthanides and Actinides -> f-orbitals) and start counting from there (there are a total of 14). This also confused me at first since I didn't know where the f-orbitals came from.

David Zhou 1L
Posts: 61
Joined: Fri Sep 29, 2017 6:04 am

Re: f-orbitals

Postby David Zhou 1L » Fri Oct 27, 2017 10:47 pm

Lanthanides and Actinides tend to be confusing because they're usually shown all on their own at the bottom, seemingly separate from the rest of the periodic table when in reality the periodic table is just made that way so that it has a nice aspect ratio that can be easily printed/copied. If you take a look at a fully expanded periodic table like the one below, it should all make more sense; it's just an intuitive extension, just like how the d orbital expands the table much more so than the p orbital does.


Sonja Kobayashi 1H
Posts: 20
Joined: Fri Sep 29, 2017 6:04 am

Re: f-orbitals

Postby Sonja Kobayashi 1H » Sun Oct 29, 2017 5:26 pm

Hello everyone!
For the electron configuration of elements in the 5d level, would you first include 4F^14 before the 5d block? For example, how would you do the electron configuration for Tungsten? Thank you so much!

Posts: 56
Joined: Sat Jul 22, 2017 2:00 am

Re: f-orbitals

Postby SantanaRodriguezDis1G » Sun Oct 29, 2017 8:26 pm

also how would you get the electron configuration for Th(thorium) would it include an f-orbital or just (Rn) 7s^26d^2 ?

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