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Helium has the highest ionization energy.
As an example potassium has a lower first ionization energy than aluminum (Al).
Helium has the highest ionization energy.
xenon increases from left to right across periods (first ionization energy)
Barium has more energy levels. So it has lesser ionization energy.
Helium has the highest ionization energy.
Fluorine has the largest first ionization energy among the halogens.
Oxygen
The element with the highest first ionization energy in group 14 is carbon.
Fluorine has the largest first ionization energy among the halogens.
Potassium has a higher ionization energy than cesium.
Helium has the highest ionization energy.
As an example potassium has a lower first ionization energy than aluminum (Al).
Ionization energy decrease down the group.So in halogens,Fluorine has highest 1st ionization energy.
Cl -apex.
Helium has the highest ionization energy.
Na, sodium