Chemistry Practice Problems Periodic Trends: Electron Affinity Practice Problems Solution: Which element has the greatest electron affinity (...

Solution: Which element has the greatest electron affinity (most negative ∆E)?a. Na or Clb. Sr or Ba

Problem

Which element has the greatest electron affinity (most negative ∆E)?

a. Na or Cl

b. Sr or Ba

Solution

Electron affinity is the energy required to add 1 mole of electrons to a gaseous element. Let's recall the trend of electron affinity in the periodic table:

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