Which of the following elements has the highest first ionization energy?
Correct answer: C. He
- A. Cs
- B. Li
- C. He
- D. I
Explanation
Helium (He) has the highest first ionization energy. This means that it requires the most energy to remove an electron from a helium atom compared to the other elements listed. The reason for this is that helium has a full valence shell with two electrons, which makes it highly stable. As a result, it takes a significant amount of energy to overcome the strong attraction between the nucleus and the electrons in helium.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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