The absolute value of the electron gain enthalpy of halogens satisfies:

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Strategy:
 Halogens have the highest Electron Gain Enthalpies. The absolute value trend shows an anomaly between the  and  periods.

Step 1: Order by magnitude
- Chlorine (Cl):  (Highest).
- Fluorine (F):  (Lower than  due to  repulsion).
- Bromine (Br):  (Lower than  due to size increase).
- Iodine (I):  (Lowest).

Order: .

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