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NEETChemistryClassification of Elements and Periodicity in Properties

Why do noble gases have large positive electron gain enthalpies?

Options

  1. AThey have small atomic sizes.
  2. BThey have low electron-electron repulsion.
  3. CThey have stable noble gas electronic configurations.
  4. DThey have to enter the next higher principal quantum level.

Correct answer

D. They have to enter the next higher principal quantum level.

Step-by-step solution

Noble gases have large positive electron gain enthalpies because the added electron has to enter the next higher principal quantum level, leading to a very unstable electronic configuration.

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