3 posts • Page 1 of 1
I know 6s should be filled first before electrons can start filling 5d orbitals. The textbook states that after 6s is filled, 4f will start to be filled, and only after 4f is filled then electrons can start filling 5d? This is the case with the example of ytterbium [Xe]4f^14 6s^2. However, Cerium's electron configuration is as follows: [Xe]4f^1 5d^1 6s^2. Is Cerium an exception to the 4f first before 5d, and until what level would we need to be able to figure out the electron configurations (e.g. until 4f orbitals+)?
I'm pretty sure Dr. Lavelle said we only needed to know/be able to figure out electron configurations through the 4th period, so I would not worry about it. To answer your question about Cerium, there are a ton of exceptions to the rules that govern the first few periods in the later periods because the energy levels become so closely packed together and electrons shift very easily between those energy states. I'm sure for Cerium, the given electron configuration is the experimentally found configuration which is the lowest energy arrangement of electrons around the Cerium nucleus. Hope that helps!
Who is online
Users browsing this forum: No registered users and 3 guests