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Which element has the lowest ionization energy?

Which element has the lowest ionization energy?
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Which element has the lowest ionization energy?

User Stacyann
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Cesium has the lowest ionization energy whereas fluorine has the highest
User Kerieks
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The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
User Stinepike
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