GKFix MCQ Question

How much energy is required to ionize a hydrogen atom if the electron occupies the n=5 orbit?

• A. -8.72 × 10^-20 J
• B. 8.72 × 10^-20 J
• C. -8.72 × 10^-18 J
• D. 8.72 × 10^-18 J