`[CoF_6]^(3-)` is a coordination complex ion.
Give the I.U.P.A.C. name of the complex.

Explanation

To determine the IUPAC name of the coordination complex ion \([CoF_6]^{3-}\), we can follow these steps:

### Step 1: Determine the oxidation state of the central metal atom (Cobalt)
The complex ion \([CoF_6]^{3-}\) has a total charge of -3. Each fluorine atom (F) has an oxidation state of -1. Since there are 6 fluorine atoms, their total contribution to the charge is:
\[ 6 \times (-1) = -6 \]
Let the oxidation state of cobalt (Co) be \(x\). Therefore, we can set up the equation:
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