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Order the steps: read a formula like K₄[Fe(CN)₆]

Exercise and reference answers

Steps
  1. Identify what lies outside the square brackets as the counter ion
  2. Everything inside the brackets is the coordination sphere
  3. Within it, name the central metal atom or ion
  4. Count the donor atoms bonded to it for the coordination number
  5. Balance the charges to find the metal's oxidation number

Explanation

Working from the outside in gets both the counter ion and the oxidation number right. Source: syllabus Chemistry Part I, Ch 5 Coordination Compounds.
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