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Question

The second ionisation potentials in electron volts of oxygen and fluorine atoms are respectively given by:

A
35.1, 38.3
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B
38.3, 38.3
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C
38.3, 35.1
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D
35.1, 35.1
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Solution

The correct option is A 38.3, 35.1
The second ionization potentials of oxygen and fluorine atoms are 38.3 eV and 35.1 eV respectively.
The electronic configuration of O+ ion is 1s22s22p3 whereas that of O2+ ion is 1s22s22p2.
Thus, during ionization, the stable configuration of half filled 2p orbital is broken. This requires high energy.
The electronic configuration of F+ ion is 1s22s22p4 whereas that of F2+ ion is 1s22s22p3.
Thus, during ionization, the stable configuration of half filled 2p orbital is formed. This requires less energy.

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