The electron gain (or attachment) enthalpies (in kJ/mol) for the elements Al thr

Question

The electron gain (or attachment) enthalpies (in kJ/mol) for the elements Al through Cl vary as follows: Al = -44 Si = -134 P = -72 S = -200 Cl = -349 a) What is the overall trend and why? b) Within the trend there is an inconsistency. What is the inconsistency, and what is its explanation?

Explanation / Answer

a) electron gain in the order means electron afiinity is in the order Cl > S > Si > P > Al b) i) Because Cl is 17th group element so If it gains 1e it will get 18th group element confiburation i.e noble gas , so it will release more energy after gaining electron In the same sence S and Si and P but in case of Al it has 3p3 valancy. so according to orbital stabilty it is more stable with half filled orbital, so it wont like to unstable it because of loosing its half configuration. So it will release less energy while adding electron.

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