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3.20  Which of the following pairs of elements would have a more negative electron gain enthalpy?  

(ii) F or Cl

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The electron gain enthalpy value of Cl  \triangle_{eg}H = -349kJ\ mol^{-1} is more negative than that of F  \triangle_{eg}H = -328kJ\ mol^{-1}.

This is because of the reason for the smaller size of F due to its small size, the electron repulsions in the relatively compact 2p-subshell are comparatively large and hence the attraction for an incoming electron is less as in the case of Cl.

Posted by

Divya Prakash Singh

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