MCQ
For the second period elements the correct increasing order of first ionisation enthalpy is
  • A
    $\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C} < \mathrm{N} < \mathrm{O}  < \mathrm{F} < \mathrm{Ne}$
  • $\mathrm{L} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F} < \mathrm{Ne}$
  • C
    $\mathrm{Li} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{N} < \mathrm{O} < \mathrm{F} < \mathrm{Ne}$
  • D
    $\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F} < \mathrm{Ne}$

Answer

Correct option: B.
$\mathrm{L} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F} < \mathrm{Ne}$
b
For same shell

$\left[s^{1} < p^{1} < s^{2} < p^{2} < p^{4} < p^{3} < p^{5} < p^{6}\right]$

$B < B e < C < O < N < F < N e$

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