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in Chemistry by (60.1k points)
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The EAN of cobalt in the complex ion [Co (en)2Cl2] 

(a) 27 

(b) 36 

(c) 33 

(d) 35

1 Answer

+2 votes
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Best answer

Correct Answer is: (b) 36 

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

So here, the atom is Cobalt (Co)

Atomic number =27

Oxidation state of Co in this compound is +3

(Because of 3 Cl atoms)

Coordination number is 6

So EAN = 27 - 3 + (2 x 6)

= 24 + 12

= 36

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