Upto which element is Aufbau's principle valid?
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Aufbau's principle is valid upto first 23 elements.
For Chromium it differs and then for copper it differs.
(Cr and Cu) draws one electron from 4s orbital to get half filled/fully filled 3d orbital, granting them pseudo-inert configuration, thus stabilizing them. This phenomena is shown by other members of their respective groups like (Cr, Mo) and (Cu, Ag, Au).
For Chromium it differs and then for copper it differs.
(Cr and Cu) draws one electron from 4s orbital to get half filled/fully filled 3d orbital, granting them pseudo-inert configuration, thus stabilizing them. This phenomena is shown by other members of their respective groups like (Cr, Mo) and (Cu, Ag, Au).
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