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Question

The electron affinity of fluorine is less than that of chlorine because:

A
the incoming electron enters the 3p orbital in fluorine.
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B
the incoming electron enters the 2p orbitals in fluorine and 3p orbital in chlorine.
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C
the electron density in fluorine is higher.
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D
fluorine has lower ionisation potential than chlorine.
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Solution

The correct option is A the electron density in fluorine is higher.
Electron affinity for fluorine is less than chlorine, most likely due to the electron-electron repulsions that occur between the electrons where n = 2. The elements in the second period have such small electron clouds that electron repulsion is greater than that of the rest of the family.

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