Energy required for the electron excitation in Li⁺⁺ from the first to the third Bohr orbit is

36.3 eV

108.8 eV

122.4 eV

12.1 eV

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Solution

108.8 eV

increment straight E space equals space 13.6 space straight Z squared space open parentheses fraction numerator 1 over denominator straight n subscript 1 superscript 2 end fraction minus fraction numerator 1 over denominator straight n subscript 2 superscript 2 end fraction close parentheses space equals space 13.6 space left parenthesis 3 right parenthesis squared space open parentheses 1 over 1 squared minus 1 over 3 squared close parentheses space equals space 108.8 space eV

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