NEET Class neet Answered

Dear Student,

Electron gain enthalpy is the energy released when an element accepts an electron. The process is endothermic.

The smaller the electronic repulsion faced by an electron to get occupied in the outermost shell, the higher the amount of energy released.

The elements O, S, Se, and Te, are arranged moving down group 16 of the periodic table.

O > S > Se > Te should be the pattern as we know that the electron gain enthalpy lowers as we go down a group.

Nevertheless, because their smaller, more compact size causes electron repulsion with the incoming electrons, period 2 elements often have lower electron gain enthalpies. Owing to its period 2 status, oxygen will have a lower electron gain enthalpy than any other chalcogen.

As a result, S > Se > Te > O is the correct order.