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Unformatted text preview: This is why cation charge = group # for groups 1A, 2A, 3A metals Ionization Energy Trends in Ionization Energy 3 A few elements GAIN electrons to form ANIONS . Electron affinity is the energy involved when an atom gains an electron to form an anion. Electron Affinity [He] O atom EA = - 141 kJ + electron O [He] -ion Trends in Electron Affinity...
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