Fluorine is more electronegative than chlorine but electron affinity of fluorine is less than chlorine.why? Explain in detail.

Asked by SIVENDU SIVENDU | 19th Jul, 2012, 06:48: PM

Expert Answer:

The electron affinity of an element is the energy given off when a neutral atom in the gas phase gains an extra electron to form a negatively charged ion. A fluorine atom in the gas phase, for example, gives off energy when it gains an electron to form a fluoride ion.

F(g) + e- -----> F-(g) deltaHo = -328.0 kJ/mol 
 
The electron cloud of F is more dense than that of Cl because Cl is larger in size. So electrons can't enter in Florine's valence shell because of electrostatic force of rapultion of electro &electron cloud. So, electron affinity of fluorine is comparatively less than chlorine.

Answered by  | 19th Jul, 2012, 07:12: PM

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