GKFix MCQ Question

What is the energy required to ionize a He⁺ ion to He²⁺?

• A. 8.72×10⁻¹⁸ J
• B. 4.36×10⁻¹⁸ J
• C. 2.18×10⁻¹⁸ J
• D. 1.09×10⁻¹⁸ J