The position of three elements A, B and C in the Periodic Table are shown below –
`{:(Group 16, Group 17),( -, -),( -, A),( - ,-),( B ,C):}`

Explanation

To determine the positions of elements A, B, and C in the periodic table based on the provided information, we will analyze the groups and the order of elements in those groups.

### Step-by-Step Solution:

1. **Identify the Groups**:
- We know that A, B, and C are positioned in Group 16 and Group 17 of the periodic table.
- Group 16 elements include: Oxygen (O), Sulfur (S), Selenium (Se), Tellurium (Te), and Polonium (Po).
- Group 17 elements include: Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
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