MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Which element 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 has the largest radius, so the lowest electron affinity.
Why the other options are wrong
- a Be: Be has the smallest radius, so the highest affinity. The answer is Ra.
- c Sr: Sr is above Ra, so its affinity is higher. The answer is Ra.
- d Mg: Mg is far above Ra. The answer is Ra: Ra has the largest radius, so the lowest electron affinity.
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