The first ionization potential of the elements B, C, and N (atomic numbers 5, 6, and 7) steadily increases, but that of O is less than that of N. The best interpretation of the lower value for O is that
A. there is more shielding of the nuclear charge in O than in B, C, or N.
B. the ionization potential of N is a maximum and the values decrease steadily for the elements O, F, and Ne.
C. the half-filled set of p orbitals in N makes it more difficult to remove an electron from N than from O.
D. the electron removed from O is farther from the nucleus and therefore less tightly bound than that in N.
E. the electron removed from O corresponds to a different value of the quantum number ℓ than that of the electron removed from B, C, or N.
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