Question 1
Question detail
What is the coordination number of a complex ion?
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. The number of ligands attached to the central metal ion.
- B. The total number of electrons in the d subshell.
- C. The number of oxidation states a metal can have.
- D. The number of unpaired electrons in the metal ion.
Answer
The number of ligands attached to the central metal ion.
Explanation
The coordination number of a complex ion refers to the number of ligands that are bonded to the central metal ion, which influences the geometry and properties of the complex.
Common mistake
Misunderstanding Variable Oxidation States
Students often confuse the oxidation states of transition metals, thinking they can only exist in one state rather than multiple states.
To clarify, remember that transition metals can exhibit variable oxidation states due to the involvement of d electrons in bonding. For example, iron can exist in +2 and +3 oxidation states. Always refer to the specific metal and its electron configuration to determine possible oxidation states.
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