What is the correct order of electron gain enthalpy of Cl, F, Te, Po?

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Strategy:
 Electron gain enthalpy becomes less negative down a group as size increases. Halogens have the most negative values, but the  period member (Fluorine) is less exothermic than the  period member (Chlorine).

Step 1: Compare Halogens
In Group 17, Chlorine () is more negative than Fluorine () due to Fluorine's high electron-electron repulsion.

Step 2: Compare with Group 16
Tellurium (Group 16) and Polonium (Group 16) are significantly less electronegative and larger than halogens, so th

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