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ChemistryNEET 2019Periodic trends: radius, ionisation enthalpy, electron gain enthalpy, electronegativity

Classification of Elements and Periodicity in Properties

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

  1. A.Li<Be<B<C<N<O<F<Ne\mathrm{Li < Be < B < C < N < O < F < Ne}
  2. B.Li<B<Be<C<O<N<F<Ne\mathrm{Li < B < Be < C < O < N < F < Ne}✓
  3. C.Li<B<Be<C<N<O<F<Ne\mathrm{Li < B < Be < C < N < O < F < Ne}
  4. D.Li<Be<B<C<O<N<F<Ne\mathrm{Li < Be < B < C < O < N < F < Ne}

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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