In the complex dichlorobis(ethylenediamine) platinum(IV) chloride, the coordination number of platinum (Pt) is 6. This is because there are two ethylenediamine (en) ligands, each providing two donor atoms (total of 4), and two chloride ions (Cl-) providing 2 additional donor atoms.
The geometry of this complex is octahedral. This is typical for coordination complexes with a coordination number of 6, where the ligands are arranged symmetrically around the central metal ion.
In summary:
- Coordination Number: 6
- Geometry: Octahedral