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KEAM EAN Rule — practice questions

Explore 1 free EAN Rule questions in KEAM Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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EAN Rule questions and exercises with answers

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The **Effective Atomic Number (EAN)** of Co in $[Co(NH_3)_6]^{3+}$ (Z(Co) = 27) is:Read the answer and worked solution →

Worked practice questions

The **Effective Atomic Number (EAN)** of Co in $[Co(NH_3)_6]^{3+}$ (Z(Co) = 27) is:

  1. 36 (krypton config, EAN rule obeyed)
  2. 35
  3. 27
  4. 30
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Correct answer: A. 36 (krypton config, EAN rule obeyed)

EAN = Z − (oxidation state) + (electron pairs from ligands × 2) = 27 − 3 + 6(2) = 36 = electron count of Kr. EAN rule obeyed.

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