SEARCH Articles Figures Tables First ionization energy periodic trends Ionization Energy Within a Period Ionization energy Ionization energy across a period Ionization energy within periodic table Ionizing energy Periodic property ionization energy Periodic table ionization energy Periodic table ionization energy and Periodic table ionization energy trends Periodic trends in first ionization energies Periodic trends in ionization energy Periodic trends in ionizing energies Periodic trends ionization energy Periodicity of ionization energy Periodicity, ionization Periods ionization energies trends