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.
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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