Name the radioactive element of group `17` ________ and group `18` _____________.

Explanation

To solve the question, we need to identify the radioactive elements in Group 17 and Group 18 of the periodic table.

### Step-by-Step Solution:

1. **Identify Group 17 Elements:**
- Group 17 is known as the halogen group. The elements in this group are Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).

2. **Determine the Radioactive Element in Group 17:**
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