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Correct order of first ionization potentials of elements of the second period

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Li<Be>B<C<N<O<F<Ne

Li<Be>B<C<N>O<F<Ne

Li<Be<B<C<N>O<F<Ne

Li<Be<B<C<N<O<F<Ne

answer is A.

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Detailed Solution

Li<Be>B<C<N>O<F<Ne.

In the period from left to right the atomic size is decreased and their by the ionization potential in increased. Any how the element with half filled or completely filled electrons in the orbitals is more stable and high ionization energy.

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