The ionization energy of Li++ is 122.4 eV. What is the ionization energy of He+?
Q1. The ionization energy of Li++ is 122.4 eV. What is the ionization energy of He+?
Answer: 54.4 eV
Explanation: Ionization energy is proportional to Z². For Li++, Z = 3, and for He+, Z = 2, so the ratio of ionization energies is (2/3)² = 4/9, hence 122.4 * 4 / 9 = 54.4 eV.