Question detail
Which of the following Group 1 elements is the most reactive?
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. Lithium
- B. Sodium
- C. Potassium
- D. Rubidium
Answer
Potassium
Explanation
Potassium is lower in Group 1 than lithium and sodium, making it more reactive due to its larger atomic size and lower ionization energy.
Common mistake
Reactivity Misunderstanding
Students often believe that reactivity increases down Group 1 because the elements become heavier.
Reactivity increases down Group 1 due to the increasing distance of the outer electron from the nucleus, which makes it easier to lose that electron.
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