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NEET 2019
Exam
NEET
Year
2019
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2019 · Chemistry · Classification of Elements and Periodicity in Properties

For the second period elements the correct increasing order of...

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

Options

  1. ALi<Be<B<C<N<O<F<Ne.Li < Be < B < C < N < O < F < Ne .
  2. BLi<B<Be<C<O<N<F<Ne.Li < B < Be < C < O < N < F < Ne .
  3. CLi<B<Be<C<N<O<F<Ne.Li < B < Be < C < N < O < F < Ne .
  4. DLi<Be<B<C<O<N<F<Ne.Li < Be < B < C < O < N < F < Ne .

Correct answer

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

Step-by-step solution

Ionisation Enthalpy ∝∝ Zeffective ∝∝ Stable configuration.

As we move from Left to right in a period, ZEffective increases. So, ionization enthalpy increases. The exceptions are as give below:

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

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