E9 Electron Affinity
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E8 Electronegativity
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E7 Ionization Energy Exceptions
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E6 Ionization Energy
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E5 Ionic Radius
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E4 Periodic Trends on the Table II
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E3 Periodic Trends on the Table
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E2 Atomic Radius and Effective Nuclear Charge
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E1 Creating the Modern Periodic Table
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