Analysis of information sources in references of the Wikipedia article "Ionization energy" in English language version.
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...The addition of the second electron into an already occupied orbital introduces repulsion between the electrons, thus it is easier to remove. that is why there is a dip in the ionization energy.
The elements of the periodic table sorted by ionization energy click on any element's name for further information on chemical properties, environmental data or health effects. This list contains the 118 elements of chemistry.
155 pm (Empirical)
The electron binding energy is the minimum energy that is required to remove an electron from an atom
... The second method is called Koopman's Theory. This method involves the HOMO.
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