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We have to explain why the reactivity of halogens decreases as we down the group.
Halogens are elements from group 7A of the periodic table. Halogens react with most metals and nonmetals in the periodic table.
When halogens react with metals, they gain 1 electron to form halide ions.
Take an example of chlorine:
Cl + e- → Cl-
The lightest halogen is also the most chemically reactive, and reactivity generally decreases as you move down the column of halogens in the periodic table. Explain this trend in terms of periodic properties.
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Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends: Electron Affinity concept. You can view video lessons to learn Periodic Trends: Electron Affinity. Or if you need more Periodic Trends: Electron Affinity practice, you can also practice Periodic Trends: Electron Affinity practice problems.
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Based on our data, we think this problem is relevant for Professor Wojcinski's class at OREGONSTATE.