Answer to Question #59962 in Other Engineering for chi

Question #59962
Doubly-ionized lithium is hydrogen-like atom. Atomic ionization energy can be predicted by an analysis using electrostatic potential and the Bohr model of the atom. For this model ionization energy will be: E= −(Z2 13.6[eV])/n2 where Z - nuclei charge. n - principal quantum number. So, for Li2+ (Z=3) energy diagram will be something like this: n=1. E1=-122.4 eV n=2. E2=-30.6 eV n=3. E3=-13.6 eV …..................................... n = infinity E = 0 (vacuum level) When n=1, corresponded E = 122.4 eV – this is ionization energy for ground state. why the answer is not E= -122.4eV instead it is E= 122.4eV?
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