Coordination Number

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Coordination number of Pt in [PtCl2(NH3)2] is:

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1. **Definition**: The coordination number ($CN$) is the total number of coordinate bonds formed between the central metal atom and the ligands.
2. **Ligand Denticity**:
   - Chlorine ($Cl^-$) is a **monodentate** ligand (forms 1 bond).
   - Ammonia ($NH_3$) is a **monodentate** ligand (forms 1 bond).
3. **Calculation**:
   - $2 	imes 1$ (for $Cl$) + $2 	imes 1$ (for $NH_3$).
   - Total Bonds = $2 + 2 = 4$.
4. **Geometry**: For $CN=4$, $Pt$ usually adopts a **square planar** geometry.

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