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

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Q. The ionization enthalpy of second period elements vary with atomic number as
The elements present at points B and E areChemistry Question Image

Classification of Elements and Periodicity in Properties

Solution:

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