Find the coordination number and oxidation state of the metal in the following complex compounds. `K[BF_4]`

Explanation

To find the coordination number and oxidation state of the metal in the complex compound \( K[BF_4] \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of the Complex:**
The complex \( K[BF_4] \) consists of a potassium ion \( K^+ \) and a coordination entity \( [BF_4]^- \). Here, \( BF_4 \) is the complex ion.

2. **Determine the Nature of the Ligands:**
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