Which of the following elements has the lowest electron affinity?
Correct answer: D. He
- A. N
- B. Cl
- C. O
- D. He
Explanation
Electron affinity is the energy change when an electron is added to a neutral atom. Noble gases like Helium (He) have a stable, full valence shell and adding an electron would require placing it in a new, higher energy level. This process is energetically unfavorable, resulting in a very low (or even positive) electron affinity.
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