Problem: Choose the element with the more negative (more exothermic) electron affinity from each pair:a. Mg or Sb. K or Csc. Si or Pd. Ga or Br

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We’re being asked to choose the element with the more negative (more exothermic) electron affinity from each pair


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. The given elements are:



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Problem Details

Choose the element with the more negative (more exothermic) electron affinity from each pair:
a. Mg or S
b. K or Cs
c. Si or P
d. Ga or Br

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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.

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Based on our data, we think this problem is relevant for Professor Cummings' class at FSU.