How many geometrical isomers are possible for the `[Ni(NH_(3))_(4)]^(2+)`?

Explanation

To determine how many geometrical isomers are possible for the complex \([Ni(NH_3)_4]^{2+}\), we can follow these steps:

### Step 1: Determine the oxidation state of Nickel (Ni)
The complex \([Ni(NH_3)_4]^{2+}\) indicates that Nickel is in the +2 oxidation state. This is because the ammonia (NH3) ligands are neutral.

**Hint:** Check the charge of the complex and the nature of the ligands to find the oxidation state.

### Step 2: Identify the coordination number and geometry
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