What are factors which influence the electron gain enthalpy ?

1.	What are factors which influence the electron gain enthalpy ?
Answer» Solution :Factors influencing ELECTRON gain enthalpy : (i)SIZE of the atom : Electron affinity is inverselyproportional to the size of the atom .As the size of atom increases , the effective nuclear charge decreases or the nuclear attraction for ADDING electron decreases. (ii)Nuclear charge : Electron affinity is directly proportional to effective nuclear charge Greater the nuclear charge more will be the TENDENCY toaccept electrons so Electron affinity is more . (iii)Electronic configuration : An atom with stable electronic configuration has no tendency to gain an electron . Such atoms have zero or almost zero electron gain enthalpy. (iv)Shielding effect :Electron affinity is inversely proportional to shielding effect . Electronic energy STATE , lying between nucleus and outermost state hinder the nuclear attraction for incoming electron . Therefore , greater the number of inner lying state , less will be the electron affinity.

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