Ionization energy of He⁺ from ground state

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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?

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4.36 × 10⁻¹⁸ J 2.18 × 10⁻¹⁸ J 8.72 × 10⁻¹⁸ J Correct 1.09 × 10⁻¹⁸ J

For He⁺ (Z=2), E = 4 × 2.18×10⁻¹⁸ = 8.72×10⁻¹⁸ J.

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