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MHT CET202620 April 2026Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Which element from following has positive electron gain enthalpy?

Options

  1. AXenon
  2. BBromine
  3. CIodine
  4. DChlorine

Correct answer

A. Xenon

Step-by-step solution

Electron gain enthalpy is the enthalpy change when an electron is added to a neutral gaseous atom. Halogens such as Chlorine, Bromine, and Iodine have a strong tendency to accept an electron to achieve a stable noble gas configuration, resulting in highly negative electron gain enthalpies. Noble gases like Xenon have a completely filled and stable valence shell ( ns^2 np^6 ). Adding an electron requires energy to place it in a higher energy principal quantum shell, overcoming interelectronic repulsions. Thus, Xenon

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