The strength of an ionic bond is an ion’s charge divided by its coordination number.Most common cations bond to 3, 4, 6, or 8 anions alkalis and other large ions bond to more.An atom’s coordination number is the number of other atoms that it bonds to.The key controls on ionic bonds are ionic size and charge.Ionic crystals contain anions packed around cations and vice versa.We can model many crystal structures as being spherical atoms held together by ionic bonds.Minerals have highly ordered and repetitive atomic arrangements.The development of X-ray diffraction techniques allowed mineralogists and chemists to directly investigate the nature of crystal structures.13.1 The atomic arrangements in quartz and sodalite 13 Atomic Structures
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