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Update to electron configuration convention?

Question asked by Alan Weir on Jun 17, 2013
Latest reply on Jun 18, 2013 by Mitsuru Yamada

I have always understood electron configurations to reflect order of fill, that is, the 4s electrons are represented prior to the 3d electrons.  Scandium's electron configuration should be [Ar]4s2 3d1.  However, numerous web pages, supported by major universitites, indicate that is not a hard-and-fast rule, that electron configurations can be written in shell order, so scandium can just as properly be shown as [Ar]3d1 4s2.  An example: 63.html  Has the convention changed?