Question

calculate the effective atomic number of central metal in (Co (en)2Cl2)Cl complex.

Answer 1

Effective atomic number = normal atomic number - oxidation state of the atom + (2*coordination number)

So here, the atom is Cobalt( Co)
Atomic number =27
Oxidation state of Co in this compound is +3
(bcoz of 3 Cl atoms)
Coordination number is 6
So EAN=27 - 3 + (2*6)
=24 + 12
=36

So The effective atomic number is 36

Answer 2

The effective atomic number of central metal in $(Co(en)_{2}Cl_{2})Cl$ complex is 36.

Explanation:

In a metal complex, the total number of electrons surrounding the nucleus of the metal is known as effective atomic number.

For calculating effective atomic number (EAN):

    EAN = normal atomic number - oxidation state of the atom + (2 × coordination number)

As here, the central metal is cobalt (Co) and its atomic number if 27. Oxidation state of cobalt in the given complex is calculated as follows.

x + 0 + (-2) + (-1) = 0

 x = +3

And, coordination number is 6. Hence, effective atomic number of this complex is calculated as follows.

EAN = $27 - 3 + (2 \times 6)$

        =24 + 12

        = 36

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