In a period, the element with highest electron affinity belongs to
Correct answer: C. Group 17
- A. Group 1
- B. Group 2
- C. Group 17
- D. Group 18
Explanation
The correct answer is Group 17. In a given period, the elements in Group 17 (halogens) have the highest electron affinity. This is because they are one electron short of a complete octet and thus have a strong tendency to gain an electron. In contrast, Group 1 and Group 2 elements have low electron affinities as they are metals that prefer to lose electrons rather than gain them. Group 18 elements, being noble gases, have complete valence shells and show minimal affinity for additional electrons.
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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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