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Which one of the following is the reason behind fluorine having lower electron affinity than chlorine?
A
Smaller radius of fluorine, high electron density.
B
Smaller radius of chlorine, high electron density.
C
Bigger radius of fluorine, less electron density.
D
Smaller radius of chlorine, less electron density.
Explanation
Fluorine has a smaller atomic radius compared to chlorine. Because of this smaller radius, the electrons in fluorine are closer together and experience more repulsion from each other. When an additional electron is added to a fluorine atom, it experiences significant electron-electron repulsion. Thus, the high electron density around the small fluorine nucleus makes the electron affinity of fluorine lower than of chlorine.
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