Question:
Which element has the lowest ionization energy?
Which element has the lowest ionization energy?
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Consider the trends in ionization energy on the periodic table.
Updated On: Jan 17, 2026
- Cesium (Cs)
- Fluorine (F)
- Helium (He)
- Oxygen (O)
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The Correct Option is A
Solution and Explanation
Ionization energy decreases down a group as the outermost electron is further from the nucleus. Cesium, being in Group 1, has the lowest ionization energy.
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