Question -The second ionization potentials in electron volts of oxygen and fluorine atoms are respectively given by?
Options:
A .  35.1, 38.3
B .  38.3, 38.3
C .  38.3, 35.1
D .  35.1, 35.1
Answer: Option C : C Second ionization potential is the energy required to remove an electron from a uni-positively charged ion. Let's look at the electronic configurations. O→2,6 O+→2,5 F→2,7 F+→2,6 I.P1 O→O+F→F+ I.P2 O→O2+F+→F2+ I.P1 of F>O as fluorine has smaller atomic size as compared to O. I.P2of O>F as O+as it is harder to ionise the O+ compared to F+.
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