Final answer:
Neon (Ne) has the highest first ionization energy among the given elements because it is a noble gas with a full valence shell, making it more stable and resistant to losing an electron.
Step-by-step explanation:
The element with the highest first ionization energy among the options Li, N, Al, and Ne is Neon (Ne). First ionization energy generally increases across a period from left to right and decreases down a group on the periodic table. Neon is located at the far right of its period and is a noble gas, which makes it the element with the highest first ionization energy in that group due to its stable electron configuration and full valence shell. Noble gases have higher ionization energies because they have full valence shells, making it more difficult to remove an electron.