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Atomic structure                                 1         2         3          4
                                                     1











                          Electron                            Electron configuration




          configuration                                       describes where electrons are
                                                              located around the nucleus of


                                                              an atom.



                                     29



                                    Cu                        For example, the electron


                                63.54                         configurations for hydrogen,

                                                                                                                         1
                                                              helium, and sodium are 1s ,

                                                                                             2
                                                                                      2
                                                                                                           1
                                                                                                     6
                                                                   2
                            (2.8.18.1)                        1s , and 1s 2s 2p 3s ,
                                                              respectively.
            Aufbau Principle                                                                                                             85




                                                    Politeknik Ibrahim Sultan
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