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The ionic radius of Fe²⁺ is larger than Fe³⁺ because:

  1. (a) Fe²⁺ has more protons
  2. (b) Fe²⁺ has two extra electrons
  3. (c) Fe²⁺ has higher nuclear charge
  4. (d) Fe²⁺ is more electronegative
Answer and solution

Answer (b) Fe²⁺ has two extra electrons

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