The coordination number of the central atom in `[Co(NH_(3))_(4)SO_(4)]NO_(3)` is _____.

Answer

To find the coordination number of the central atom in the coordination compound \([Co(NH_3)_4SO_4]NO_3\), we can follow these steps:

### Step 1: Identify the central atom
The central atom in the given coordination compound is cobalt (Co).

### Step 2: Identify the ligands attached to the central atom
In the compound \([Co(NH_3)_4SO_4]NO_3\), we can see that there are two types of ligands:
1. Ammonia (NH₃) - There are 4 ammonia ligands.
2. Sulfate (SO₄) - There is 1 sulfate ligand.

### Step 3: Count the number of ligands
Now, we need to count the total number of ligands that are directly attached to the central cobalt atom:
- From the 4 ammonia ligands: 4
- From the 1 sulfate ligand: 1

### Step 4: Calculate the coordination number
The coordination number is defined as the total number of ligands attached to the central metal atom. Therefore, we add the number of ammonia ligands and the sulfate ligand:
\[ \text{Total ligands} = 4 \text{ (from NH}_3\text{)} + 1 \text{ (from SO}_4\text{)} = 5 \]

### Step 5: Conclusion
Thus, the coordination number of the central atom (cobalt) in the compound \([Co(NH_3)_4SO_4]NO_3\) is **5**.

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