What is EAN of Co in [ Co ( NH ₃ )₆ ]³⁺ ?

Step-by-step solution

The Effective Atomic Number (EAN) for cobalt in [ Co ( NH ₃)₆]³⁺ is calculated using the standard formula: EAN = Z - Oxidation State + 2 ( Number of Ligands Denticity ) Cobalt has atomic number Z = 27 . In this complex, with six neutral NH ₃ ligands and an overall +3 charge, cobalt's oxidation state is +3. Each NH ₃ is monodentate, donating one electron pair, contributing 6 2 = 12 electrons. Substituting values: EAN = 27 - 3 + 12 = 36 . The Effective Atomic Number is 36 .