b. Calculate the energy of the fourth Bohr orbit of the B^4+ ion? (answer should be in eV)

c. Determine the radius of the fourth Bohr orbit of the hydrogen atom? (answer in nm)

d. Determine the radius for the fourth Bohr orbit of the B^4+ ion? (answer in nm)

e. Calculate the ionization energy of C^5+ (answer in KJ/mol)

really confused any help is glady welcomed, thanks in advance.

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