Question detail
What is the reason for the decrease in reactivity of halogens down the group?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The periodic table
Question
- A. Increased shielding effect
- B. Decreased number of protons
- C. Increased ionization energy
- D. Decreased molecular mass
Answer
Increased shielding effect
Explanation
The increased shielding effect from inner electrons makes it harder for the outer electrons to be attracted to the nucleus, thus reducing reactivity.
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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