Question detail
Explain how the coordination number affects the geometry of a complex ion.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Transition metals (A-level only)
Question
Explain how the coordination number affects the geometry of a complex ion.
Answer
The coordination number determines the spatial arrangement of ligands around the central metal ion. For example, a coordination number of 4 typically results in a tetrahedral geometry, while a coordination number of 6 leads to an octahedral geometry.
Explanation
This answer is strong as it connects coordination number with geometric arrangement, illustrating the relationship between these concepts. The question assesses the student's ability to analyze the implications of coordination number on complex ion structure.
Common mistake
Misunderstanding Coordination Number
Students often confuse the coordination number with the number of ligands attached to the central metal ion, thinking they are the same.
The coordination number refers to the total number of coordinate bonds formed between the central metal ion and the ligands, which may not always equal the number of ligands due to bidentate or polydentate ligands. To clarify, remember that each ligand can form multiple bonds. For example, in a complex with two bidentate ligands, the coordination number would be 4, even though there are only 2 ligands.
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