Which of the following elements is a halogen?

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Multiple Choice

Which of the following elements is a halogen?

Explanation:
Halogens are the elements in Group 17 of the periodic table, nonmetals with seven valence electrons that are highly reactive, especially with metals to form salts. Chlorine sits in this group, so it behaves as a halogen. Its reactive nature and tendency to form compounds like sodium chloride illustrate this. The other elements listed are noble gases—neon, helium, and argon—characterized by full valence shells and very low reactivity, so they are not halogens.

Halogens are the elements in Group 17 of the periodic table, nonmetals with seven valence electrons that are highly reactive, especially with metals to form salts. Chlorine sits in this group, so it behaves as a halogen. Its reactive nature and tendency to form compounds like sodium chloride illustrate this. The other elements listed are noble gases—neon, helium, and argon—characterized by full valence shells and very low reactivity, so they are not halogens.

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