MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Which of the following elements has the lowest electron affinity?
Think it through first, then pick an option.
- a Be
- b Ra
- c Sr
- d Mg
Answer and explanation
Correct answer: b Ra
Ra is at the bottom of group 2 with the largest radius; electron affinity falls as radius grows, so its electron affinity is the lowest.
Why the other options are wrong
- a Be: Be is at the top of group 2 with the smallest radius, so its electron affinity is the highest, not the lowest.
- c Sr: Sr sits above Ra and has a smaller radius than Ra, so its electron affinity is higher than that of Ra.
- d Mg: Mg is near the top of group 2 with a small radius, so its electron affinity is higher than that of Ra.
More board questions on this topic
- Which element has the higher ionization energy?
- Which element has the lowest electron affinity?
- Which element has the higher ionization energy?
- For elements P, Q and R of the passage:
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