1.

The first ionisation potential is maximum forA. `B`B. `N`C. `O`D. `Be`

Answer» Correct Answer - B
Ionisation potential generally increases when we more in a period from left to right but `IE_(1)` of `N_(2)` is greater than that of `O_(2)`. It is due to the more stable (half-filled orbitals) configurations of `N`.


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