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Chemistry Question on trends in periodic table

The ionization enthalpy of second period elements vary with atomic number as The elements present at points B and E are

A

Be, C

B

B, N

C

Be, O

D

Be, N

Answer

Be, N

Explanation

Solution

The electronic configuration of Be = 1s2,2s21s^{2}, 2s^{2} (Fully filled). The electronic configuration of N = 1s2,2s2,2p31s^{2}, 2s^{2}, 2p^{3} (Half filled). Due to stable electronic configuration of Be and N the IE of these elements is more than elements of the next group.