Questions  

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

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By Expert Faculty of Sri Chaitanya
a
Li
b
Li
c
Li
d
Li
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detailed solution

Correct option is C

As we move across a period, ionisation enthalpy increases, because of increased nuclear charge and decrease in atomic radii. However, abnormal values are observed for Be, N and Ne due to extra stability of half filled and fully filled orbitals. Thus, the actual order is, Li

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