Question : The correct order of electron affinity of Halogens is –
Option 1: F < I < Br < Cl
Option 2: I < Br < Cl < F
Option 3: I < Br < F < Cl
Option 4: I > Br > F > Cl
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Correct Answer: I < Br < F < Cl
Solution : The correct option is I < Br < F < Cl .
The electron affinity of an element is the energy change that occurs when an electron is added to a neutral atom to form a negative ion. Generally, electron affinity increases across a period (from left to right) in the periodic table and decreases down a group (from top to bottom).
Chlorine has the highest affinity among all. It is because it has the largest atomic size. Iodine has the lowest affinity.
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