What is a chelate ligand? Give one example

Explanation

### Step-by-Step Solution:

1. **Definition of Chelate Ligand**:
A chelate ligand is a type of ligand that can form multiple bonds to a single metal ion. These ligands have the ability to wrap around the metal ion, forming a stable ring structure known as a chelate complex.

2. **Characteristics of Chelate Ligands**:
- Chelate ligands are typically poly-dentate, meaning they have multiple donor atoms that can coordinate with the metal ion.
- They are often acyclic in their free form, meaning they do not initially form a ring until they bond with a metal ion.
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