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The correct trend represents ionization energy, which is a measure of the energy required to remove an electron from an atom or ion. Ionization energy generally increases from left to right across a period and decreases from top to bottom within a group on the periodic table. Lithium(Li) is in group 1 and period 2, Nitrogen(N) is group 15 and period 2, and Fluorine(F) is group 17 and period 2. As we move from left to right across the period, the atomic number increases which leads to a stronger attraction between the nucleus and the electrons, resulting in higher ionization energy. Therefore the ionization energy of Li