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Question :-
Why is energy absorbed when electron is added to uni-negative ion?
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Answers
☆☞ A uni-negative atom, already has one excess electron in its valence shell, which is providing it its negetive charge, now when, another electron is added to the valence shell, it faces repulsion from this already present electron, and thus, some energy is required to add this electron which makes it energy/heat......
ANSWER :-
An uni-negative atom, already has one excess electron in its valence shell, which is providing it is negative charge, now when, another is added to the valence shell, it faces repulsion from this already present electron, and thus, some energy is required to add this electron which makes it energy/ heat absorbing (exothermic).
While a neutral atom, when adding another electron does not face any such repulsion (as it's a neutral species), hence, it goes on to achieve noble gas configuration and thus releases energy to become stable.