Question detail
How does the boiling point of halogens change as you descend Group 7, and what is the reason for this change?
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
How does the boiling point of halogens change as you descend Group 7, and what is the reason for this change?
Answer
The boiling point of halogens increases as you go down Group 7. This increase is attributed to the larger atomic size and greater van der Waals forces that require more energy to overcome.
Explanation
This answer is strong as it clearly states the trend and provides a scientific explanation for the observed change. The question assesses the ability to connect physical properties with atomic structure.
Common mistake
Melting and Boiling Points Confusion
Students often confuse the trends in melting point and boiling point down Group 7, thinking both increase instead of recognizing that melting points increase while boiling points also increase but at a different rate.
To fix this, students should create a table comparing the melting and boiling points of Group 7 elements, noting the specific values and trends to visualize how each property changes down the group.
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