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Edexcel IAL Chemistry 17.10 coordination number

Count donor atoms bonded to the central ion, not just ligand molecules, and use bidentate ligands or structures to infer shape, charge and bond angle.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Count coordination number from formulae, structures or dative-bond counts.
  • Use bidentate ligand information to complete coordination number, shape or bond angle.
  • Deduce complex-ion formulae from mole ratios and octahedral coordination.

17.10—The meaning of the term ‘coordination number’ question 1

[Maximum number: 1]

The structure of the complex CrX2(CHX3COX2)X4(HX2O)X2\ce{Cr2(CH3CO2)4(H2O)2} is shown.

What is the coordination number of chromium in this complex?

Figure for Question 17.10—The meaning of the term ‘coordination number’ question 1 — Edexcel A-Level Chemistry A2
A

two

B

four

C

six

D

twelve

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