Answer
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Work Step by Step
The second oxygen and sulfur affinity to the electron is endothermic due to electrostatic repulsion. The first attraction to electrons would be exothermic as energy is released when a negative electron is attracted by the positive nucleus. However, if an electron is produced from oxygen and sulfur, it becomes negative ions (O- and S-, respectively). Then, adding an electron is undesirable, since electrostatic repulsion can occur between the electron and the negative ion. Energy would then need to be used to add a second electron — hence the second electron affinity will be endothermic.