Question

Second ionisation energy of nitrogen phosphorous arsenic

Answer 1

To get a better understanding of second ionization enthalpies we must have a look at their electronic configurations, which are -

-As 3d10 4s2 4p3

-N 2s2 2p3

-P 3s2 3p3

The second ionization will follow the trends - N, P and As. Because as the number of shells increases, it comes easier to take out the electrons.