Question detail
What is the coordination number of an octahedral complex?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Transition metals (A-level only)
Question
- A. 2
- B. 4
- C. 6
- D. 8
Answer
6
Explanation
An octahedral complex has a coordination number of 6, meaning it has six ligands surrounding the central metal ion, forming an octahedral shape.
Common mistake
Misidentifying Complex Shapes
Students often confuse the geometry of octahedral and tetrahedral complexes, mistakenly describing tetrahedral complexes as octahedral due to the number of ligands.
To fix this, remember that octahedral complexes have six ligands arranged around the central metal ion, while tetrahedral complexes have four ligands. Visualize the shapes: octahedral complexes resemble two pyramids base-to-base, while tetrahedral complexes form a three-dimensional triangle. Always relate the number of ligands to the geometry.
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