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Name: Joash
Status: student
Grade: other
Country: Malaysia
Date: Spring 2010


Question:
Why is platinum's electron configuration [Xe] 4f14 5d9 6s1 instead of [Xe] 4f14 5d8 6s2? I filled the electron configuration according to the order of filling orbitals and 6s subshell is filled before 5d subshell. so why does the 1 electron from the 6s subshell goes to the 5d subshell? is there any general way to spot when to shift the electrons in the s subshells to other subshells?



Replies:
especially for high atomic number atoms, where "cross over" of orbitals is fairly common. The explanation is fairly involved and to some degree "ad hoc". If you look in a most Inorganic Chemistry texts you will find the explanation at several degrees of difficulty. One, but certainly not the only one, is "Inorganic Chemistry" by James E. Huheey.

Vince Calder



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