Coordination number of a metal is:
ACharge
BMass
CPeriod number
DNumber of atoms of ligand directly bonded to the metal
Answer & Solution
Correct answer: D. Number of atoms of ligand directly bonded to the metal
**Coordination number (CN):** number of donor atoms attached to the central metal.
**Most common:** 4 and 6. E.g., [Fe(CN)₆]³⁻ has CN = 6.
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