The electron gain enthalpy order for halogens is Cl>F>Br>I Due to small size of fluorine the extra electron to be added feels more electronelectron repulsion. Therefore fluorine has less value for electron affinity than chlorine.
JEE Main 2013 — Chemistry Inorganic Chemistry
Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :
Held on 9 Apr 2013 · Verified 6 Jul 2026.
High ionization enthalpy of fluorine
Smaller size of chlorine atom
Smaller size of fluorine atom
Bigger size of 2p orbital of fluorine
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