Account fot the following:
The electron gain enthalpy of Cl (Z = 17 )is more negative than that of Fluorine ( Z = 9 ).

" The electron gain enthalpy of "O" is less negative than that of "S" ."

Why first electron gain enthalpy of sulphur is more negative then oxygen?

Give reason for the following. a) The electron gain enthalpy of O is less negative than that of S. b) The size of anion is larger than the parent atom.

How would you account for the following : (i) The electron gain enthalpy with negative sign is less for oxygen than that for sulphur. (ii) Phosphorus shows greater tandency for catenation than nitrogen. (iii) Fluorine never acts as the central atom in polyatomic interhalogen compounds.