Ionization Energy and Electron Affinity - Purdue University
WebSecond, Third, Fourth, and Higher Ionization Energies. By now you know that sodium forms Na + ions, magnesium forms Mg 2+ ions, and aluminum forms Al 3+ ions. But have you ever wondered why sodium doesn't form Na 2+ ions, or even Na 3+ ions? The answer can be obtained from data for the second, third, and higher ionization energies of the element.
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