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Since ligands are Lewis bases (electron pair donors), I believe you would try identifying which molecule is donating an electron pair to form a coordinate covalent bond. From there, you could possibly determine the number of ligands. As a result of coordinate covalent bond formation, a coordination compound is made. Hope this answers your question!
DMaya_3C wrote:The number of ligands attached to central ion, which is actually the number of donor atoms is basically the coordination number.
In other words, the number of bonds also equals the coordination sphere! For example, with [Fe(CN)6]4- everything within the bracket is inside the coordination sphere, and with that knowledge you know that the coordination number is 6! This example was taken from Lecture #24 if you're still confused I recommend reaching it :). Hope this helps!
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