Q33 / 160 · TS EAMCET 2010 · Chemistry

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

  • A
    $3 s^2 3 p^5$
  • B
    $3 s^2 3 p^4$
  • Correct answer
    C
    $3 s^2 3 p^3$
  • D
    $3 s^2 3 p^2$

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, $i e, 3 s^2, 3 p^3$.

Hence, the correct answer is option: 'C'.

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