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Which one of the halogens is radioactive...

Which one of the halogens is radioactive ?

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### Step-by-Step Solution: 1. **Identify the Halogens**: The halogens are a group of elements found in Group 17 of the periodic table. The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). 2. **Research Radioactive Elements**: Among the halogens, we need to determine which one is radioactive. Radioactive elements are those that have unstable nuclei and emit radiation as they decay into more stable forms. 3. **Identify Astatine**: Astatine (At) is the halogen that is known to be radioactive. It has the atomic number 85 and is located in the 6th period of the periodic table. ...
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