Ionization Energy
The first ionization energy of hydrogen atom is 13.6 eV. What is the ionization energy of He⁺ ion?
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About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- ionization energy
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
54.4 eV
For hydrogen-like species (single-electron systems), the ionization energy is: IE=(13.6 eV)×Z2
- Hydrogen (H): Z=1⟹IE=13.6 eV.
- Helium Ion (He+): Z=2. IEHe+=13.6×22=13.6×4=54.4 eV
- The higher charge of the helium nucleus (+2) attracts the single electron much more strongly than the hydrogen nucleus (+1), requiring 4 times more energy to remove it.
This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of ionization energy. It appeared in the 2025 exam.
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