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Which element has the lowest first ionization energy?
Quick Answer
Francium is usually listed as having the lowest first ionization energy, estimated at about 4.07 eV.
The Full Story
Francium is widely considered to have the lowest first ionization energy of the elements, though the value is estimated because the element is scarce and highly radioactive. Its first ionization energy is about 4.07 eV, which means it loses its outermost electron relatively easily. As an alkali metal, francium follows the trend of decreasing ionization energy down the group. Its chemistry is hard to measure directly because no long-lived sample can be accumulated.
Key Facts
1.Francium first ionization energy: about 4.07 eV
2.Element symbol: Fr
3.Atomic number: 87
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Suggested video title for this topic:
"The element that gives up its outer electron most easily"
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