List of Elements in Order of Ionization Energy (eV)

List of elements ordered by ionization energy is listed in the table below with atomic number, chemical symbol and ionization energy (eV). To list the elements order by ionization energy, click on the table headers. You can print the list of elements by hitting the print button below.

The element which has the highest ionization energy is Helium with 24.58741 eV. And the element which has the lowest ionization energy is Caesium in 3.8939 eV.