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  4. Second and successive electron affinity of an element

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Q. Second and successive electron affinity of an element

Classification of Elements and Periodicity in Properties

Solution:

$O_{(g)}+e^{-} \xrightarrow[-E A_{1}]{} O^{\ominus}(g)+e^{-} \xrightarrow[+E A_{2}]{} O_{(g)}^{2-}$
Energy is required to add an electron to the negatively charged species due to electron-electron repulsion.