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Size:  505.9 KBI don't understand the answer to 3ii. It says suggest why f is n endothermic process and the answer is because the negative s- ion repels the added electron which I don't understand. Can someone explain this to me please?
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    Energy is needed to overcome this replusion
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    you're adding a negative electron to an already negative anion. Therefore there will be repulsion between the electron and the ion and energy must be used to enable this process, making it endothermic
 
 
 
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