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    Issue Determining delta E using Bohr

    This is the question I'm having trouble this. My professor is claiming that the answer is #3, but I am NOT getting that. I am assuming the nucleus charge is 2 - which gives me answer #4. This is what I'm doing - delta E = -2.18E-18 (2^2) (1/9-1/4) = 1.21x10^-18 I even tried the nucleus...