Ncert Exercises & Solutions

Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:

1. $[Ne] 3 s^{2} 3 p^{1}$

2. $[Ne] 3 s^{2} 3 p^{3}$

3. $[Ne] 3 s^{2} 3 p^{2}$

4. $[Ar] 3 d^{10} 4 s^{2} 4 p^{3}$

Hint: Element having half-filled and fully-filled electronic configuration has high ionization enthalpy.

The electronic configuration of options (b) and (d) have exactly half-filled 3p orbitals (b) represents phosphorus and (c) represents arsenic but (b) is smaller in size than (d).

Hence, (b) has the highest ionization enthalpy increases left to right in the periodic table as the size decreases.

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