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2.1 Basics of Structures


                 Approximation: atoms can be treated like spheres









                                                Concepts for the radius of the spheres






                                                                                                                          elements or
                             element or                                    compounds                                      compounds

                            compounds                                             only
                                                                                                                            („alloys“)























                                    =                                               =                                              =

                      d/2 of single bond                                   d – r(F, O…)                                    d/2 in metal

                           in molecule                              problem: reference!
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