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KVPY2017ChemistryClassification of Elements and Periodicity in Properties

The first ionisation energy of Na , B , N and O atoms follows the order

Options

  1. AB < Na < O < N
  2. BNa < B < O < N
  3. CNa < O < B < N
  4. DO < Na < N < B

Correct answer

B. Na < B < O < N

Step-by-step solution

N has half filled stable configuration and Na is most electropositive element.

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