Electron Affinity: Exercise

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−
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