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Manipal MET2020ChemistryClassification of Elements and Periodicity in Properties

Which element has maximum first ionisation potential?

Options

  1. ACs
  2. BF
  3. CNa
  4. DHe

Correct answer

D. He

Step-by-step solution

Atoms and ions having inert gas configuration (such as helium), i.e. stable (half-filled) configuration have high ionisation potential, i.e. it is relatively easy to remove an electron from a partially filled valence shell, where Z_ eff is lower but it is relatively difficult to remove an electron from an atom or ion that has a filled valence shell, where Z_ eff is higher.

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