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Singly ionized helium (He+) atom/ion has a single remaining electron and a nuclear charge of +2?...

Singly ionized helium (He+) atom/ion has a single remaining electron and a nuclear charge of +2? (twice that of a proton). Using the Bohr model with appropriate modifications, estimate a) the radius and b) the total energy (in electron volts) of such an atom in its first excited level. c) When the state of this atom changes from the first excited level to the ground level, a photon is emitted in the process. Estimate the energy (in electron volts) of this photon.

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