Modern periodic table question-B
Ionisation energy or ionisation enthalpy is the energy required to remove an electron from the isolated gaseous neutral atom to form a positively charged ion.
First Ionization Energy, energy needed to remove the outermost or highest energy, electron from a neutral atom in the gas phase.
Li Li+ + e-
Coming to the query,
Both Li and F belong to the same period (Period 2).
- Li : 1s22s1
- F : 1s22s22p5