Question

What is the ionization energy of Lithium?

Answer 1

1. Ionization energy is depicted as the energy needed to withdraw an electron from the outermost shell of an isolated gaseous atom.
2. The first ionization energy of Lithium is $520kJmo{l}^{-1}.$
3. The electronic configuration of Lithium is $1{\mathrm{s}}^{2}2{\mathrm{s}}^1$.
4. The electrons belonging to the s-subshell lie close by to the nucleus. So, eliminating an electron from the $2s$ orbital is hard.
5. Hence, additional energy is imposed to eliminate the electron.
6. Consequently, the ionisation energy of Lithium is significantly high.