The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative if energy is released during the process. Using the electron configuration of the atom or ion undergoing the addition of an electron, predict whether the electron affinity will be positive or negative for the following reactions, and classify them accordingly.
Electron affinity and electron configuration of the atoms
The electron affinity of elements is a periodic property, so you can predict whether the electron affinity of an element is positive or negative based on its electron configuration.
In general, you can use the following rules to correlate electron affinity and electron configuration:
I(g) + e− → I− (g), ΔE < 0
O− (g) + e− → O2− (g), ΔE > 0
Xe(g) + e− → Xe− (g), ΔE > 0
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
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.