What is effective Atomic number? Calculate $E A N$ of cobalt in $[C o (N H_{3})_{6}]^{+ 3}$

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Solution

The sum of the number of electrons, donated by all ligands and those present on the central metal ion or atom in complex is called as effective atomic number (EAN).

EAN of $[C o (N H 3)_{6}]^{3 +}$

$E A N = [27 - 3 + 2 (6)] = 36$

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