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  4. The ionisation enthalpy of second period elements vary with atomic number as <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/6a201e3facf7c63685d9a9d540e8b685-.png /> The elements present at points B and E are

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Q. The ionisation enthalpy of second period elements vary with atomic number as
image
The elements present at points $B$ and $E$ are

Classification of Elements and Periodicity in Properties

Solution:

The electronic configuration of $Be =1 s^{2}, 2 s^{2}$ (fully filled).

The electronic configuration of $N =1 s^{2}, 2 s^{2}, 2 p^{3}$ (half filled).

Due to stable electronic configuration of $Be$ and $N$ the $I E$ of these elements is more than elements of the next group.