Among halogens, the correct order of amount of energy released in electron gain 3 (electron gain enthalpy) is:

(i) F > Cl > Br > I

(ii) F < Cl < Br < I

(iii) F < Cl > Br > I

(iv) F < Cl < Br < I

Answers (1)

The answer is the option (iii) F < Cl > Br > I

 Explanation: Within the same group, electron gain enthalpy becomes less negative while going down in the group. However, with the addition of an electron to the 2p-orbital leads to greater repulsion than the addition of an electron to the larger 3p- orbital. Hence, in following halogens, chlorine is the element with the highest negative electron gain enthalpy.

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