Which has higher electron affinity: Cl or Na+?

Answer: Na+ has a higher electron affinity than Cl.

The energy released when an electron is added to a neutral gaseous atom is known as electron affinity.

  • The electron affinity increases across a period while it decreases down a group.
  • In halogens chlorine posses the highest electron affinity in the periodic table.
  • As atomic radii increases, electron affinity increases.
  • As nuclear charge increases, electron affinity increases.
  • It decreases down a group and increases across a period.
  • The unit for electron affinity is kilo joules per mole.

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