Electronic configuration of Cu is [Ar] 3d10 4s1. Which rule is violated in this configuration?

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Atomic Structure and Interatomic Bonding topics include: Materials classification, atomic structure terminology, atomic models, atomic bonding in solids and elements periodic table.   Interatomic bonding, also known as chemical bonding, is the force that holds atoms together in molecules and crystal structures. It involves the attraction between positively charged nuclei and negatively charged electrons.  Here are some types of interatomic bonding: Covalent bonding: A strong directional bonding that is characteristic of metalloids. Covalent bonds provide great attraction forces between... Show more

Electronic configuration of Cu is [Ar] 3d10 4s1. Which rule is violated in this configuration?