Why are full electron shells considered stable?

  1. I've always heard that when atoms make ions or create chemical blonde, thru try to make their electron configurations the same as that of a noble thereby filling their electron shells and making them stable. Why then, are noble gas election configurations considered stable?
     
  2. jcsd
  3. DrDu

    DrDu 4,115
    Science Advisor

    The point is that electrons in the same shell are not very effective in screening each other from the nuclear charge, i.e. in filling up a shell, the electrons see a higher and higher effective nuclear charge, thus increasing the binding energy. This effect is maximal for a filled shell and minimal for a shell with just one or two electrons.
     
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