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Question
Calculate effective atomic number of \[\ce{[Co(NH3)6]^3+}\] ion.
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Solution
The oxidation state of Co is +3, and ligands donate 12 electrons.
Z = 27, X = 3, Y = 12
EAN of \[\ce{Co^3+}\] = Z – X + Y
= 27 – 3 + (2 × 6)
= 27 – 3 + (12)
= 36
EAN of \[\ce{[Co(NH3)6]^3+}\] in is 36.
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