| 11. | Ionization energy becomes greater up and to the right of the periodic table.
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| 12. | *Values from CRC are ionization energies given in the unit kJ / mol.
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| 13. | Rubidium has a very low ionization energy of only 406 kJ / mol.
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| 14. | For a given atom, successive ionization energies increase with the degree of ionization.
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| 15. | I = 13.6 eV is the ionization energy of hydrogen.
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| 16. | Each successive ionization energy is markedly greater than the last.
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| 17. | Large jumps in the successive molar ionization energies occur when passing noble gas configurations.
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| 18. | Ionization energies are linked approximately to orbital energies by Koopmans'theorem.
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| 19. | Other editors had added ionization energy figure to other WPs.
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| 20. | The second ionization energy of all of the alkaline metals is also somewhat low.
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