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AP EAMCET202124 Aug 2021Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

If the successive ionisation energies of an element A are 165, 190, 550 and 595 kcal , respectively, then the ground state electronic configuration of element A is

Options

  1. A[ Ne ] 3 s^2 3 p^2
  2. B[ He ] 2 ~s ^1
  3. C[ He ] 2 s^2 2 p^2
  4. D[ Ne ] 3 ~s ^2

Correct answer

D. [ Ne ] 3 ~s ^2

Step-by-step solution

aligned & IE ₁=165 kcal , IE ₂=190 kcal . & IE ₃=550 kcal , IE ₄=595 kcal aligned As ionisation energy value (first and second) of element A is lower, than third and fourth ionisation energy. So, it indicates that valence shell posess 2 electrons. Configuration of element A is [ Ne ] 3 ~s ^2 .

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