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Calculate the binding energy E_n=1 in eV and the classical Bohr radius a_0 in Å for an electron in the K shell (n=1) in the centroid system of the following atoms and hydrogen-like ions:
(a) hydrogen, deuterium, muonic hydrogen, myonium and positronium.
(b) He+, C^(5)+, Mo^(41)+ and Pb^(81)+

Need solution ASAP!!! Thx in advance.

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