The binding energy for the third electron in the ground state of Li-atom should be — Atomic Structure Chemistry Question

💡 Solution & Explanation

The third electron in Li refers to the innermost (1s) electron of the H-like Li^2+ ion (Z=3, n=1). B.E. = 13.6 * Z^2 / n^2 = 13.6 * 9 / 1 = 122.4 eV.