Associate Safety Professional Practice Exam

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Which of the following does NOT belong to the halogen family?

Chlorine
Astatine
Bromine
Radon

The correct answer is: Radon

Radon does not belong to the halogen family, which is composed of group 17 elements in the periodic table. The halogen group includes fluorine, chlorine, bromine, iodine, and astatine, all of which have similar chemical properties, such as being highly reactive and having seven electrons in their outermost shell. Radon, on the other hand, is a noble gas found in group 18 of the periodic table. Noble gases are known for their lack of reactivity due to having a full outer electron shell, making them very stable and inert. This fundamental difference in chemical properties and position in the periodic table is why Radon is not classified as a halogen.