What is the coordination number of Co in `[Co(NH_3)_6]^(3+)` ?

Explanation

To determine the coordination number of cobalt in the complex ion \([Co(NH_3)_6]^{3+}\), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Coordination Number**:
The coordination number is defined as the number of ligand donor atoms that are directly bonded to the central metal atom in a coordination complex.

2. **Identify the Central Metal Atom**:
...