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Question
On the four halogens, the one which has the highest electrons affinity is_______.
On the four halogens, the one which has the highest electrons affinity is_______.
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Solution
The correct option is C chlorine
Fluorine, though higher than chlorine in the periodic table, has a very small atomic size. This makes the fluoride anion so formed unstable (highly reactive) due to a very high charge/mass ratio. The electron being gained by fluorine would be taken in to a much
smaller 2p orbital and requires more electron coupling energy than that
of much larger 3p orbital of chlorine. Therefore, there are more repulsions in smaller 2p orbital and it has lower electron affinity than chlorine.
Fluorine, though higher than chlorine in the periodic table, has a very small atomic size. This makes the fluoride anion so formed unstable (highly reactive) due to a very high charge/mass ratio. The electron being gained by fluorine would be taken in to a much smaller 2p orbital and requires more electron coupling energy than that of much larger 3p orbital of chlorine. Therefore, there are more repulsions in smaller 2p orbital and it has lower electron affinity than chlorine.
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