Which of the following is not a halogen?

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Multiple Choice

Which of the following is not a halogen?

Explanation:
Halogens are the elements in Group 17 of the periodic table. They are highly reactive nonmetals that readily gain one electron to form negative ions and commonly react with alkali metals to make salts. Oxygen sits in Group 16, the chalcogens, and while it is also a nonmetal essential for life, it isn’t part of the halogen family. Its main form at standard conditions is diatomic O2, not a halogen molecule. So oxygen is not a halogen; fluorine, chlorine, and iodine are.

Halogens are the elements in Group 17 of the periodic table. They are highly reactive nonmetals that readily gain one electron to form negative ions and commonly react with alkali metals to make salts. Oxygen sits in Group 16, the chalcogens, and while it is also a nonmetal essential for life, it isn’t part of the halogen family. Its main form at standard conditions is diatomic O2, not a halogen molecule. So oxygen is not a halogen; fluorine, chlorine, and iodine are.

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