Question

which has greater ionisation potential N and P and explain​

Answer 1

Explanation:

It is natural to expect that oxygen has a higher ionisation energy than nitrogen due to the fact that the first ionisation energy increases across a period. This is because when moving from left to right, the atomic number increases which means that the nuclear charge increases. Nitrogen has a half filled orbital.

Answer 2

N has greater ionisation potential
Because, in the periodic table down the group atomic radius increases and ionisation energy decreases due to increase in number of shells and decrease in effective nuclear charge on outermost electron due to shielding effect and distance between outermost electron and nucleus.