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AP EAMCET2010ChemistryClassification of Elements and Periodicity in Properties

The electron affinity values of elements A, B, C and D are respectively -135,-60,-200 and -348 ~kJ ~mol ~m ⁻¹ . The outer electronic configuration of element B is

Options

  1. A3 s^2 3 p^5
  2. B3 s^2 3 p^4
  3. C3 s^2 3 p^3
  4. D3 s^2 3 p^2

Correct answer

C. 3 s^2 3 p^3

Step-by-step solution

Elements having half or completely-filled orbitals, ie, having stable electronic configuration have very low negative value of electron affinity. Since, the electron affinity of B is lowest among the given, it has stable electronic configuration, i e, 3 s^2, 3 p^3 .

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