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JIPMER2004ChemistryClassification of Elements and Periodicity in Properties

Which of the following order of ionisation energy is correct?

Options

  1. AB Be N C
  2. BBe B C N
  3. CB Be C N
  4. DBe B C N

Correct answer

C. B Be C N

Step-by-step solution

Ionisation energy generally increase in a period from left to right. But due to comparatively stabler configuration of Be (1 s^2, 2 s^2 ) , it has more ionisation energy than Boron (1 s^2, 2 s^2, 2 p^1 ) . Hence, the correct order is : B Be C N

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