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Down a group, electron affinity ______ [increases, decreases, remains same].

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Question

Down a group, electron affinity ______ [increases, decreases, remains same].

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Solution

Down the group, electron affinity decreases.

Explanation:

As you move down a group, the atomic size increases because new electron shells are continuously added. This places the outermost shell much farther away from the nucleus and increases the shielding effect of the inner electrons. Consequently, the nucleus exerts a weaker attractive force on an incoming electron, resulting in less energy being released when that electron is added.
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Chapter 1: Periodic Properties and Variations of Properties: Physical and Chemical - Questions from ICSE Examinations [Page 23]

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Frank Chemistry Part 2 [English] Class 10 ICSE
Chapter 1 Periodic Properties and Variations of Properties: Physical and Chemical
Questions from ICSE Examinations | Q 2011. 3. (b) | Page 23
S.P. Singh Concise Chemistry [English] Class 10 ICSE
Chapter 1 Periodic Table, Periodic Properties and Variations of Properties
EXERCISE-1 | Q (B) 1. (d) | Page 19
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