Description

Arrange elements from LOWEST to HIGHEST ionization energy. 4 sets: Set 1: Na, Mg, Al, Si, Cl (across Period 3: Na<Mg≈Al<Si<Cl, generally increases L→R). Set 2: Li, Na, K, Rb (down Group 1: Rb<K<Na<Li, decreases going down so Li has highest). Set 3: F, Ne, Na (across the Period 2-3 boundary: Na has l

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