Which element is a halogen?

Prepare for the Pre-IB Grade 9 Science Exam with detailed flashcards and multiple-choice questions. Each question is paired with hints and thorough explanations. Ace your test with confidence!

Multiple Choice

Which element is a halogen?

Explanation:
Halogens are the highly reactive nonmetals in Group 17 of the periodic table, characterized by seven valence electrons and a strong tendency to gain one more electron to complete an octet. Fluorine fits this pattern, so it is a halogen. Neon, by contrast, is a noble gas with a complete outer shell and very low reactivity. Oxygen belongs to the chalcogens in Group 16, and silicon is a metalloid in Group 14, so neither matches the halogen group.

Halogens are the highly reactive nonmetals in Group 17 of the periodic table, characterized by seven valence electrons and a strong tendency to gain one more electron to complete an octet. Fluorine fits this pattern, so it is a halogen. Neon, by contrast, is a noble gas with a complete outer shell and very low reactivity. Oxygen belongs to the chalcogens in Group 16, and silicon is a metalloid in Group 14, so neither matches the halogen group.

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