Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number

Explanation

To determine the formula of an oxoanion of manganese (Mn) where it shows an oxidation state equal to its group number, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Group Number of Manganese:**
Manganese (Mn) is located in Group 7 of the periodic table. This means its group number is 7.

2. **Determine the Oxidation State:**
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