His theory
postulated the use of two types of linkages (primary and secondary) by a
metal atom/ion in a coordination compound In the modern language of chemistry
these linkages are recognised as the ionisable (ionic) and non-ionisable (covalent)
bonds, respectively Using the property of isomerism, Werner predicted the
geometrical shapes of a large number of coordination entities The Valence Bond Theory (VBT) explains with reasonable success, the
formation, magnetic behaviour and geometrical shapes of coordination compounds