Due to the increased distance and shielding effect, the attraction of outermost electron in aluminium experiences less attraction towards nucleus and thus the ionization energy decreases. Elements that lies very close in the periodic table form covalent bonds due to less difference in ionization energies value. NIST Atomic Spectra Database Ionization Energies Form. Some numbers vary based on rounding. For example the ionization energy of sodium is 496 kJ/mol but chlorine first ionization energy is 1251.1 kJ/mol, so due to difference in the energy values the chemically combine and form ionic bonds. For example, Li has higher ionization energy than Na. Ionization energies decrease along a group because elements lower on the table have higher atomic numbers, which means more protons and thus more electrons. To convert from eV to kJ/mol, multiply by 96.4689. The second ionization energy is energy to remove a second electron and is greater than that required to remove the first electron. 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