Question detail
Predict the state of iodine at room temperature and explain your reasoning based on its position in Group 7.
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
Predict the state of iodine at room temperature and explain your reasoning based on its position in Group 7.
Answer
Iodine is a solid at room temperature. This is predicted based on its position in Group 7, where elements become more solid as you move down the group due to increasing molecular mass and stronger van der Waals forces.
Explanation
This answer is strong as it connects the physical state of iodine to its molecular mass and group trends. The question assesses the student's ability to apply knowledge of periodic trends to predict properties.
Common mistake
Misunderstanding Reactivity Trends
Students often think that reactivity increases down Group 7 instead of decreases.
Remember that as you move down Group 7, the outer electrons are further from the nucleus, making it harder for the atom to attract electrons and thus decreasing reactivity.
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