What are the most important coordination numbers encountered in coordination compounds ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Coordination Compounds**: Coordination compounds are formed by the coordination of metal ions with ligands. The number of ligands attached to the central metal ion is referred to as the coordination number.

2. **Identifying Common Coordination Numbers**: The most important coordination numbers encountered in coordination compounds are 4 and 6. These numbers are significant because they correspond to common geometrical arrangements of ligands around the central metal ion.

3. **Geometrical Arrangements**:
- **Coordination Number 4**: This can lead to two possible geometries:
...