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Q.
Which of the following has highest ionization enthalpy?
Rajasthan PMTRajasthan PMT 2010Classification of Elements and Periodicity in Properties
Solution:
The electronic configuration of atoms of group 15 are half filled, ie, $ (np_{x}^{1},\,\,np_{y}^{1},\,\,np_{z}^{1}) $ and are stable therefore, they have high ionization enthalpy. Ongoing down the group, the ionization enthalpy decreases due to increase in atomic size. Hence, $ N $ has highest ionization enthalpy.