What is the IUPAC name of complex `[Ni(NH_3)_6]Cl_2`?

Explanation

To determine the IUPAC name of the complex \([Ni(NH_3)_6]Cl_2\), we will follow these steps:

### Step 1: Identify the oxidation state of Nickel (Ni)
Let the oxidation state of Nickel be \(x\). The complex has six ammonia (\(NH_3\)) ligands, which are neutral and contribute \(0\) to the overall charge. The two chloride ions (\(Cl^-\)) each have a charge of \(-1\), contributing a total of \(-2\) to the overall charge.

The equation for the overall charge of the complex can be set up as follows:
\[
x + 0 - 2 = 0
...