What changes do you do to Aufbau's electron configuration after 23(vanadium)?

Question

In my notes I borrowed from a friend in Chemistry he highlighted aufbaus principle does not work after the element Vanadium.

But nothing on what adjustment or a new principle.

Answer 1

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it's because of the stability of d5 and d10 - it still works but you have to remember that Cr and Cu are exceptions in this row as d5s1 and d10s1 configuration is more stable than d4s2 and d9s2, respectively for Cr and Cu. There is more exceptions in higher rows due to relativistic effects

Source(s): http://en.wikipedia.org/wiki/Electron_configuratio...