Coordination number is a characteristic of which of the following?
A. Central atom
B. Ligand
C. Coordination entity
D. Coordination compound
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Origin of the question is Definitions in division Coordination Compounds of Chemistry – Class 12
Right answer is A. Central atom
The best explanation: Coordination number is also known as the secondary valence of a central metal ion in a complex and is defined as the number of donor atoms it is directly bonded to. Hence, coordination number is a quantity associated with the metal ion.