Practice question
Question
The ionization energy of a hydrogen atom from its ground state is 2.18 × 10⁻¹⁸ J. What is the energy required to ionize He⁺ from its ground state?
Explanation
For He⁺ (Z=2), E = 4 × 2.18×10⁻¹⁸ = 8.72×10⁻¹⁸ J.
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