Learning objective
Explain coordination number in complex ions.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Flashcards
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Topic
Transition metals (A-level only)
Subtopic
Complex ions and ligand substitution (A-level only)
Study support
Understand this objective
Quick explanation
Explain coordination number in complex ions
- This point belongs to Transition metals (A-level only), especially Complex ions and ligand substitution (A-level only).
- You need to be able to explain coordination number in complex ions.
- The key ideas to know are coordination number and complex ion.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Complex ions and ligand substitution (A-level only) to exam-style questions, flashcards, and revision notes for Transition metals (A-level only).
Quick student answer
What is the coordination number of a complex ion?
Direct answer
The coordination number of a complex ion is defined as the number of ligand donor atoms that are bonded to the central metal ion.
Key terms
- Coordination Number: The number of ligand donor atoms bonded to a central metal ion in a complex.
- Ligand: A molecule or ion that donates a pair of electrons to a central metal ion to form a coordination complex.
Common trap
Confusing coordination number with oxidation state: Remember that the coordination number refers to the number of bonds formed with ligands, while the oxidation state indicates the charge of the metal ion.
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Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Define a transition metal as a d-block element forming at least one ion with an incomplete d subshell.
Transition-metal characteristics (A-level only)
- Explain variable oxidation states in transition metals.
Transition-metal characteristics (A-level only)
- Explain why transition-metal ions are often coloured.
Transition-metal characteristics (A-level only)
- Explain catalytic activity of transition metals and their compounds.
Transition-metal characteristics (A-level only)
- Define ligand and coordinate bond.
Complex ions and ligand substitution (A-level only)