Recently the platinum complex known as cisplatin has been found in the treatment of _________and is represented as_______ .

Answer

### Step-by-Step Solution:

1. **Identify the Platinum Complex**: The compound in question is cisplatin, which is a coordination compound of platinum.

**Hint**: Look for the specific name of the platinum complex mentioned in the question.

2. **Write the Chemical Formula**: The chemical formula for cisplatin is represented as PtCl2(NH3)2. This indicates that it contains platinum (Pt), two chloride ions (Cl), and two ammonia molecules (NH3).

**Hint**: Remember that the formula reflects the coordination of ligands around the central metal atom.

3. **Determine the Oxidation State of Platinum**: In cisplatin, platinum is in the +2 oxidation state. This is important for understanding its chemical behavior.

**Hint**: Consider how the charges of the ligands contribute to the overall charge of the complex.

4. **Describe the Geometry**: The geometry of cisplatin is square planar. This is typical for d8 metal complexes, such as those of platinum(II).

**Hint**: Visualize how the ligands are arranged around the platinum atom to determine the geometry.

5. **Function of Cisplatin**: Cisplatin is primarily used in the treatment of cancer. It works by preventing the replication of DNA in cancer cells, which is crucial for their growth and division.

**Hint**: Think about the biological mechanism by which cisplatin exerts its therapeutic effects.

### Final Answer:
Cisplatin has been found in the treatment of **cancer** and is represented as **PtCl2(NH3)2**.