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NEET2019ChemistryClassification of Elements and Periodicity in PropertiesActual

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

Options

  1. ALi < Be < B < C < N < O < F < Ne .
  2. BL i < B < B e < C < O < N < F < N e .
  3. CL i < B < B e < C < N < O < F < N e .
  4. DLi < Be < B < C < O < N < F < Ne .

Correct answer

B. L i < B < B e < C < O < N < F < N e .

Step-by-step solution

Ionisation Enthalpy ∝ Z effective ∝ Stable configuration. As we move from Left to right in a period, Z Effective increases. So, ionization enthalpy increases. The exceptions are as give below:

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