Trend of second Electron Affinity for N,O,F,P,S,Cl

I am aware of the definition of electron affinity and electron gain enthalpy (EGE). N has positive EGE1, and EA of P,S,Cl is more than N,O,F respectively. I want to arrange them in order of their EA2 in periods and groups.


My attempt : F,Cl attain noble gas and it's EA would be close to IE (ionization energy) of alkali metals, so, quite small. O and S would be halogen with quite high EA. P and N would be S and O so, somewhere in between the above two.


Hence, O>N>F and S>P>Cl.


for groups, I would still say that 3rd period would have more EA than 2nd but the only data that I have (from another chemistry.stack question) is 2nd EA of O is more than S.


Some help regarding data availability of EA2 is needed and fault in my logic.


