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NEET CHEMISTRYMedium

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

1

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

2

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

3

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

4

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

Step-by-Step Solution

'Be' and 'N' have comparatively more stable valence sub-shell than 'B' and 'O'. Therefore, the correct order of first ionisation enthalpy is: Li<B<Be<C<O<N<F<NeLi < B < Be < C < O < N < F < Ne.

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