Give the IUPAC name of `(NH_4)_3 [ Co(ONO)_6]`

Explanation

To determine the IUPAC name of the compound \((NH_4)_3[Co(ONO)_6]\), we can follow these steps:

### Step 1: Identify the Cation and Anion
The compound consists of two parts: the cation \((NH_4)^+\) and the anion \([Co(ONO)_6]^{3-}\). The cation is ammonium, and the anion contains cobalt coordinated with nitrito ligands.

### Step 2: Determine the Ligands
In the anion \([Co(ONO)_6]^{3-}\), the ligand is nitrito, which is derived from nitrite (NO2). The nitrito ligand is denoted as "nitrito" when it is bound through the nitrogen atom, which is the case here.

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