| 21. | According to your web page, the first ionization energy of astatine is 20KJ / mol.
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| 22. | Both of these factors further increase the ionization energy.
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| 23. | In 2015, the first ionization energy of lawrencium was measured, using the isotope 256 Lr.
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| 24. | Excited-state ionization energies can be measured by photoelectron spectroscopy.
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| 25. | Elements in the same period show trends in atomic radius, ionization energy, electron affinity, and electronegativity.
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| 26. | Elements in the same group tend to show patterns in atomic radius, ionization energy, and electronegativity.
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| 27. | Caesium has the lowest measured ionization energy of all the elements and helium has the greatest.
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| 28. | But would the first ionization energy of Cl + be equal to 349 kJ / mol?
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| 29. | Likewise, would the electron affinity of Cl-be related to that first ionization energy of Cl neutral?
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| 30. | The structural chemistry of boron is dominated by its small atomic size, and relatively high ionization energy.
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