Question

how to find coordination number with example​

Answer 1

Answer

Coordination Number refers to the number of atoms(or molecules or ions) attached to the central metal atom.

To calculate the coordination no. of a compound , we see the constituents in the coordination sphere ( or the square bracket , emitting the outer atom/s ).

For example:

[Pt(en)2]CO3

(bis(ethylenediamine)platinum(II) carbonate)

The coordination sphere is [Pt(en)2]2+, since (CO3)2- exists as an anion.

So here Pt is the central metal ion or the coordination center( which is generally a metal) is attached to 2 ions i.e (en) I.e ethylenediamine.

So, since Pt is surrounded by 2 (en) in the coordination sphere ,

And since en is a bi-dentate i.e attaches itself from two sides due to presence of lone pairs.

we can say coordination no. Is 4.

Answer 2

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