Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?

Which one of the following arrangements represents the correct order o

1.	Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?
Answer» `OltSltFltCl` `ClltFltSltO` `SltOltCiltF` `FltClltOltS` Solution :Electron GAIN ENTHALPY becomes more negative across a period while it becomes LESS negative in a group However,electron gain enthalpy of O or F is less than that of the succeding element.Whenelectron is ADDED to n=2,the repulsion is more than when it is added to n=3 in case of Cl or S.