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  4. The correct order of ionization energy in the following second-period elements is:

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Q. The correct order of ionization energy in the following second-period elements is:

NTA AbhyasNTA Abhyas 2022

Solution:

Ionization energy increases along the period. But $Be\left(2 s^{2}\right)$ and $N\left(2 s^{2} 2 p^{3}\right)$ have higher ionization energy than boron and oxygen respectively due to stable electronic configuration (half-filled and full-filled subshells are exceptionally stable).