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 tendency for catenation than nitrogen.
(iii) Fluorine never acts as the central atom in polyatomic interhalogen compounds.
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(i) This is due to smaller size of oxygen the electron cloud is distributed over a small region of space, making electron density high which repels the incoming electrons.
(ii) Because P—P bond is stronger than N—N bond.
(iii) Fluorine never acts as the central atom in polyatomic inter-halogen compounds since it is the most electronegative element of the group.