Which of the following has highest ionisation enthalpy?
(a)Nitrogen
(b)Phosphorus
(c)Oxygen
(d)Sulphur
(a)Nitrogen
Explanation:
The electronic configuration of atoms of group 15 are half filled 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.
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