Which of the following group of elements have positive 1st electron affinity?
Correct answer: D. VIIA
- A. IA
- B. VIA
- C. IIA
- D. VIIA
Explanation
Group VIIA elements have positive first electron affinity, indicating they tend to gain electrons easily. This is why option D is correct. Options A, B, and C are incorrect because they have negative first electron affinities, meaning those groups tend to lose electrons easily.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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