The lightest halogen is also the most chemically reactive, and reactivity generally decreases as we move down the column of halogens in the periodic table. Explain this trend in terms of periodic properties.

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Q: exceptions to the periodic trends in ionization energy?

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Q: What is the characteristic valence electron configuration of the group 7A elements, the halogens?

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Q: What is the characteristic valence electron configuration of the group 7 A elements, the halogens?

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