Q3 / 160 · AP EAMCET 2022 (08 Jul Shift 1) · Chemistry

The electronic configuration which is associated with highest first ionisation enthalpy is:

  • A
    $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^2$
  • Correct answer
    B
    $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3$
  • C
    $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^4$
  • D
    $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^1$

Solution

Half-filled or completely filled orbitals attain extra stability due to symmetrical distribution of electrons and high exchange energy.

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

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