Exercise on Electron Affinity

Question: Which equation correctly represents the electron affinity of calcium?

  1. Ca (g) → Ca+ (g) + e−
  2. Ca (g) + e− → Ca− (g)
  3. Ca+ (g) + e− → Ca (g)
  4. Ca (g) → Ca− (g) + e−
  5. Ca−(g) → Ca (g) + e−
For more details, please contact me here.