Account for the large difference in first and second electron affinity of oxygen.
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"Answer:
When an electron is added to Oxygen atom to form O- ion , energy is released . Therefore, first electron gain enthalpy of oxygen is in negative being -141 kJ/mol.
But when another electron is add to O- ion to form O2- ion , it feels a greater electrostatic repulsion. Thus, when we add 2nd electron , then energy is absorbed by it. that's why the 2nd electron gain enthalpy of oxygen is positive being +780kJ/mol .
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