Q3 / 180 · COMEDK 2018 · Chemistry

In the following, the element with the highest ionisation energy is

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

Solution

The element [Ne] $3 s^{2} 3 p^{3}$ have half-filled $p$-orbital. As a result, it is more stable. $\therefore$ The ionisation energy is highest for this element.

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

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