Linked Questions

4
votes
1answer
11k views

What is the reason for the anomalous electronic configuration of palladium? [duplicate]

The p block elements generally have the general valence shell configuration as $$n\mathrm{p}^{1-6}\,n\mathrm{s}^{1-2}.$$ Expected electronic configuration for palladium is $$\ce{^46Pd} = \mathrm{1s^2\,...
0
votes
1answer
183 views

Nature of transition metals [duplicate]

The transition metals have valence and penultimate shell incompletely filled . so does this mean that the transition metals first fill up their valence shell and then penultimate shell?
17
votes
3answers
64k views

Anomalous electronic configuration of platinum

Why is the electronic configuration of platinum $$\mathrm{[Xe] 4f^{14} 5d^9 6s^1}$$ and not $\mathrm{[Xe] 4f^{14} 5d^{10} 6s^0}$ or $\mathrm{[Xe] 4f^{14} 5d^8 6s^2}$?
12
votes
2answers
30k views

Anomalous electronic configurations

Cu has an anomalous electron configuration. $\ce{Cu ~=~ 1s^2~2s^2~2p^6~3s^2~3p^6~4s^1~3d^{10}}$, it does not follow the usual pattern. In this case, the 3d subshell is filled before the 4s, which ...
3
votes
2answers
2k views

What is wrong with the Aufbau principle that results in so many exceptions?

From what I have observed in the periodic table is that many transition elements do not follow the Aufbau principle. And it's not just the elements like $\ce{Cu}$ and $\ce{Cr}$ that differ from ...
6
votes
3answers
322 views

Computational methods to obtain relative energies of electronic configurations of atoms

When one learns the Aufbau principle to “predict” electronic configurations, and the $(n + \ell)$ ordering rule (or Madelung rule), one also learns of the exceptions to the rules… some of which (Cr, ...
9
votes
1answer
1k views

Is the half-full rule and full rule followed in the 6th and 7th periods?

Is the half-full rule and full rule followed in the 6th and 7th periods? (Note: Half-full rules is Hund's rule) Example: What is the correct electron configuration? $$\ce{W = [Xe] 6s^2 4f^{14} 5d^4}$$...
5
votes
2answers
2k views

Why is the ground state electronic configuration of Group 10 (Ni group) elements so anomalous?

While studying about d block elements I came across this table showing outer shell electronic configuration of group 10 elements $\ce{Ni}$ $ $ $ $ $ $ $ $ $ $ $3d^8$ $4s^2$ $\ce{Pd}$ $ $ $ $ $ $ $ $ ...
0
votes
1answer
540 views

How to calculate energy gap when determining electron configuration?

The weird electron configuration of Niobium was well explained on this post: How can one explain Niobium’s weird electronic configuration? It was pointed out that electrons fill orbitals with higher ...
3
votes
2answers
227 views

Are there atoms with different numbers of protons, but the same number of electrons, with different orbital occupations?

Imagine there is an electron-stripped nucleus with $Z$ protons, in high vacuum and isolated. Then you add electrons, one by one, and check which orbitals are filled. Will this depend on $Z$ at all, or ...