Ionization - This is why cation charge = group # for groups...

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1 Ionization Energy IE = energy required to remove an electron from an atom in the gas phase. Mg (g) + 738 kJ ---> Mg + (g) + e- Mg (g) + 738 kJ ---> Mg + (g) + e- Mg + (g) + 1451 kJ ---> Mg 2+ (g) + e- Mg + has 12 protons and only 11 electrons. Therefore, IE for Mg + > Mg. Ionization Energy
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2 Mg (g) + 735 kJ ---> Mg + (g) + e- Mg + (g) + 1451 kJ ---> Mg 2+ (g) + e- Mg 2+ (g) + 7733 kJ ---> Mg 3+ (g) + e- Energy cost is very high to dip into a shell of lower n (core electrons).
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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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Ionization - This is why cation charge = group # for groups...

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