Unidentated

Xe is a unidentated ligand. A ligand is a molecule or ion that donates a pair of electrons to a metal atom or ion to form a coordinate bond. The number of electron pairs donated by a ligand is known as its dentate or coordination number.

Explanation:

1. Definition of a ligand
A ligand is a molecule or ion that donates a pair of electrons to a metal atom or ion to form a coordinate bond. Ligands can be classified based on the number of electron pairs they donate.

2. Dentate or coordination number
The coordination number of a ligand refers to the number of electron pairs it donates to the metal atom or ion. This coordination number can vary depending on the ligand.

3. Types of ligands
Ligands can be classified into various types based on their coordination number. Some common types include:

- Unidentate ligands: These ligands donate only one electron pair to the metal atom or ion. Examples include H2O (water), NH3 (ammonia), and Cl- (chloride ion).
- Bidentate ligands: These ligands donate two electron pairs to the metal atom or ion. Examples include ethylenediamine (en), oxalate ion (C2O4^2-), and 1,2-diaminocyclohexane (dach).
- Ambidentate ligands: These ligands can donate one electron pair through different atoms. For example, nitrite ion (NO2-) can donate through nitrogen or oxygen.
- Hexadentate ligands: These ligands donate six electron pairs to the metal atom or ion. Examples include EDTA (ethylenediaminetetraacetic acid) and DTPA (diethylenetriaminepentaacetic acid).

4. Xe as a ligand
In the given question, Xe is identified as a unidentate ligand. This means that Xe donates only one electron pair to the metal atom or ion. Xe can form coordination compounds with metals, such as [PtXeCl4]2-.

Overall, Xe is classified as a unidentate ligand because it donates only one electron pair to the metal atom or ion.