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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!
Hope this helps!
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!
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.
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.
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