In coordination compounds, metals show two types of linkages, primary and secondary. Primary valencies are ionisable and are satisfied by negatively charged ions. Secondary valencies are non-ionisable and are satisfied by neutral or negative ions having lone pair of electrons. Primary valencies are non-directional while secondary valencies decide the shape of the complexes.

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CASE_STUDIESCoordination Number in ComplexesIUPAC Nomenclature of Coordination CompoundsWerner's Theory of Coordination CompoundsValence Bond Theory for Coordination CompoundsCBSE PYQ4 sub-questions

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