As an example potassium has a lower first ionization energy than aluminum (Al).
xenon increases from left to right across periods (first ionization energy)
Barium has more energy levels. So it has lesser ionization energy.
Halogens, specially fluorine
T he smallest first ionization energyis for lithium.
Al is a Metal
As an example potassium has a lower first ionization energy than aluminum (Al).
The first level ionization energy oif aluminium is 577,5 kJ/mol.All alkali metals have lower values for the ionization energy.
Helium has the highest ionization energy.
Phosphorus. Across the period, first ionization energy increases.
Fluorine has the largest first ionization energy among the halogens.
Potassium has a higher ionization energy than cesium.
Ionization energy decrease down the group.So in halogens,Fluorine has highest 1st ionization energy.
Na, sodium
xenon increases from left to right across periods (first ionization energy)
Barium has more energy levels. So it has lesser ionization energy.
The ionization energy of fluorine is 1681 kJ/mol (the first) and the ionization energy of iodine is 1008,4 kJ/mol.
Sodium