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A scandium ion with a single electron (denoted Sc20+) is in an excited state with radius...

A scandium ion with a single electron (denoted Sc20+) is in an excited state with radius the same as that of the ground state of hydrogen.

(a) What is n for the Sc20+ ion?

(b) How much energy in eV is needed to ionize the ion from this excited state?
eV

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