Question detail
Explain why the reactivity of halogens decreases as you move down Group 7 of the periodic table.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The periodic table
Question
Explain why the reactivity of halogens decreases as you move down Group 7 of the periodic table.
Answer
Reactivity decreases down Group 7 because the outer electrons are further from the nucleus, resulting in a weaker attraction to the nucleus. This makes it more difficult for the halogens to gain an electron, which is necessary for their reactivity.
Explanation
This answer is strong because it clearly links the concept of atomic structure to the observed trend in reactivity within Group 7. The question tests the student's understanding of the relationship between atomic structure and chemical properties.
Common mistake
Reactivity Misunderstanding
Students often think that reactivity increases down Group 7 instead of decreases.
Focus on the concept that as you move down Group 7, the outer electrons are further from the nucleus, making it harder for the atom to attract additional electrons, thus decreasing reactivity.
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