The coordination number is determined by the number of sigma bonds formed by ligand donor atoms directly with the central metal atom/ion. Pi bonds, if present, are not considered when determining the coordination number.
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The coordination number of the central atom/ion in a complex is determined by the number of ligand donor atoms directly bonded to it. It represents the total count of coordinate bonds formed between the central metal and surrounding ligands. The coordination number is influenced by the nature of the ligands and the geometry the complex adopts. Different ligands and geometric arrangements lead to various coordination numbers, such as 4 for tetrahedral, 6 for octahedral, and 2 for linear complexes. The coordination number defines the overall structure, stability, and reactivity of the coordination complex in chemical reactions.