Amongst the element with following electronic configurations, which one of them may have the highest…

Amongst the element with following electronic configurations, which one of them may have the highest ionization energy ?
  1. $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^1$
  2. $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^3$
  3. $[\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^2$
  4. $[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 4 \mathrm{p}^3$

Solution

$\begin{array}{lc} \text{Electronic configuration} & \text{Group} \\ {[\mathrm{Ne}] 3s^{2} 3p^{3}} & \text{V} \\ {[\mathrm{Ne}] 3s^{2} 3p^{2}} & \text{IV} \\ {[\mathrm{Ar}] 3d^{10} 4s^{2} 4p^{3}} & \text{V} \\ {[\mathrm{Ne}] 3s^{2} 3p^{1}} & \text{III} \\ \end{array}$ Since $IE$ increases in a period and decreases in a group, $[\mathrm{Ne}] 3s^{2} 3p^{3}$ configuration has the highest ionisation energy among the given.

Asked in: NEET 2009 (Mains)

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