Exercise 2A.5

[Rachel Kho Disc 2G]

There are some electron configurations with [Xe]4f145d106s2. Where exactly is the 4f14 coming from? I thought it might be the lanthanides and actinides, but I counted 15 columns and not 14 columns, so I'm a little confused.

[Jiwon_Chae_3L]

The f subshell should have 14 orbitals, it might be that the periodic table is written differently as some variants of the periodic table are organized strangely.

[Bethany Yang 2E]

Oh that is a good point, I did not even think of counting 15... I just looked at it that the f subshell has 14 orbitals, so that would be the amount of space one could fill.

[Madilyn Schindler 3E]

If I'm understanding your question correctly, there are 14 because the first elements of the lanthanide and actinide series are part of the d-block. So La and Ac would actually be 5d1 and 6d1, leaving the other 14 to be parts of the f subshell. Hope that helps!