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Question

Which has higher electron affinity: Cl or Na+?


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Solution

Trend in Electron Affinity

  • Electron affinity is the amount of energy released when an electron is added to a neutral atom to form an anion.
  • The measurement of electron affinities is difficult.
  • Due to increasing nuclear attraction, electron affinity increases from left to right across a period.

Higher electron affinity

  • Cl (Chlorine) has a higher electron affinity than Na+ (Sodium).
  • In the periodic table, chlorine has the greatest electron affinity of all the halogens.
  • The electron affinity rises as the atomic radius increases.
  • As the nuclear charge increases, so does electron affinity.

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