23. The ionization energy for a hydrogen atom is \( 1.31 \times 10^4 \) J/mol. What is the ionization energy for He⁺?
(A) \( 8.72 \times 10^4 \) J/mol
(B) \( 1.31 \times 10^4 \) J/mol
(C) \( 5.25 \times 10^4 \) J/mol
(D) \( 2.18 \times 10^4 \) J/mol

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