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Have atomic models been proposed that do not have overlapping N levels?
For example orbital 4s2 fills before orbital 3d10. N level 4 overlaps with N level 3.
I understand the current model predicts 24 Cr to fill [Ar] 3d4 4s2 but actually fills [Ar] 3d5 4s1. Doesn't that show there might be something wrong with the model?
Quantum theory.
This is puzzling. Unless you have a specific question to understand this phenomenon, then this thread has no specific purpose.
It is quantum theory that predicts and explain such orbital filling, ie why the 4s is filled ahead of the 3d.
This is puzzling. Unless you have a specific question to understand this phenomenon, then this thread has no specific purpose.
Zz.
How exactly does quantum theory predict and explain why 24 Cr fills [Ar] 3d5 4s1 and not [Ar] 3d4 4s2?
Because it calculates the energy required to fill all of those! It predicts shielding effects, and it shows that since the symmetry of the 3d orbitals extends further from the nucleus, on average, than the 4s orbital, the 3d will NOT have a lower energy than the 4s in terms of filling up the orbitals!
There is no mystery here. This is a very standard topic in quantum chemistry topic, something you would have discovered had you try looking it up.
Zz.
Quantum theory.