Which of the following has the highest ionization energy value?
Correct answer: D. He
- A. Li
- B. H
- C. Be
- D. He
Explanation
Ionization energy generally increases across a period and up a group. Helium (He) is at the top right of the periodic table, has a very stable full valence shell, and a high nuclear charge for its size, giving it the highest first ionization energy of any element.
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