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The element with maximum negative electron gain enthalpy is:
A
F
B
Br
C
I
D
Cl
Explanation
Generally, electron gain enthalpy decreases down the group in a periodic table. But, electron gain enthalpy of F is less negative than that of the Cl because when an electron is added to F, the added electron goes to the smaller (n = 2) quantum level and suffers significant repulsion from the other electrons present in this level. For the n = 3 quantum level, the added electron occupies a larger region of space in Cl and the electron repulsion is much less.
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