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Periodic Table and Periodicity question

2019 · Q102
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Periodic Table and Periodicity question

2019 · Q102

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
For the second period elements the correct increasing order of first ionization enthalpy is :
  1. A
    Li < B < Be < C < N < O < F < Ne
  2. B
    Li < Be < B < C < O < N < F < Ne
  3. C
    Li < B < Be < C < O < N < F < Ne
  4. D
    Li < Be < B < C < N < O < F < Ne
View written solutionFree

Correct answer: C

Ionisation enthalpy increases in a period from left to right, because of increased nuclear charge and decrease in atomic radii. But because of half filled orbitals of Be, N and fully filled orbitals of Ne, stability of those atoms inceases.

So, the correct increasing order of first ionisation enthalpy will be :
Li < B < Be < C < O < N < F < Ne

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