f block elements

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Mario Reyes 1C
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Joined: Fri Apr 06, 2018 11:04 am

f block elements

Postby Mario Reyes 1C » Sun May 06, 2018 9:07 pm

When writing electron configurations where you need to include the f block, why is the principal quantum number 2 behind the row. For example, for Tungsten the electron configuration is [Xe]4f^14 5d^4 6s^2. I understand the d block is 1 less, but why is the f block 2 less?

Amir Akhavan 1E
Posts: 34
Joined: Fri Apr 06, 2018 11:01 am

Re: f block elements

Postby Amir Akhavan 1E » Sun May 06, 2018 9:14 pm

Professor Lavelle said we will not have to deal with any electron configurations past Krypton. However, this is just a general rule I would be familiar with. Similar to how the d block is one behind, the f is two behind.

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Re: f block elements

Postby Chem_Mod » Sun May 06, 2018 10:22 pm

Yes, similar to the d-block, f-block is always 2 less. Because 4f is the first shell which f-orbital exists, and we need to fill them first before we do 5f or 6f. However, the energy is such that it occurs after 6s.

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