Problem: Which halogen has the lowest electron affinity?

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We’re being asked to determine the halogen with the lowest electron affinity


Recall that electron affinity is the energy change from the addition of 1 e to a gaseous element/ion. It is represented by this chemical equation:


Atom(g) + e  Ion(g), ΔE = –E.A. 


The trend for electron affinity is as follows: it increases from left to right and decreases down a period in the periodic table. 

From top to bottom, the halogens are:


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Which halogen has the lowest electron affinity?

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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 Comfort's class at UTAH.