Fluorine is more electronegativity than nitrogen. The best explanation is that:

Options

A. the valency electrons in F are on the average, a little farther to the nucleus than in N
B. the charge on a F nucleus is `+9`, while that on N nucleus is `+7`
C. the nitrogen has half filled valence shell electron configuration, `ns^(2)np^(3)` where as fluorine has partially filled electron configuration `ns^(2)np^(5)`
D. the electronegativity decreases from top to bottom in each of the group as the effect nuclear charge remains constant.

Answer

B