TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
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 \(3 s^2 3 p^4\)
- C \(3 s^2 3 p^3\)
- D \(3 s^2 3 p^2\)
Answer & Solution
Correct Answer
(C) \(3 s^2 3 p^3\)
Step-by-step Solution
Detailed explanation
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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