Thursday, June 15, 2017

inorganic chemistry - Electronic configuration of tellurium


Below is a copy of the method I am using to determine electron configurations.



Question:




Write the full and short electron configuration for tellurium.



My final answer was:


Full Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4


Short: $[\ce{Kr}]~\ce{5s^2 4d^10 5p^4}$




However, checking with google, it seems the answer is actually: $[\ce{Kr}]~\ce{4d^10 5s^2 5p^4}$


Is the silly "follow the yellow brick road" thing faulty? Or is it that order doesn't matter in this situation?



Answer



I haven't done that in decades (or so), but I'd bet that you did right!



The result from google only lists the final outcome, not the order in which the orbitals are filled. Except for some examples $\ce{La}$, $\ce{Ac}$, etc., the Aufbau principle is reliable. So: Follow the yellow brick road :)


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