First slide
Periodic Trends

For the second period elements the correct increasing order of first ionization enthalpy is


As we move across a period, ionisation enthalpy increases, because of increased nuclear charge and decrease in atomic radii. However, abnormal values are observed for Be, N and Ne due to extra stability of half filled and fully filled orbitals. Thus, the actual order is, Li<B<Be<C<O<N<F<Ne

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