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(D) Electron affinity is the energy released when an electron is added to a neutral gaseous atom or ion.$A$. $Be (2s^2)$ has a stable fully-filled con

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$A, B$ and $C$ only

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(D) Electron affinity is the energy released when an electron is added to a neutral gaseous atom or ion.$A$. $Be (2s^2)$ has a stable fully-filled configuration. Adding an electron is unfavorable,making the electron affinity negative (energy must be supplied).$B$. $N (2s^2 2p^3)$ has a stable half-filled configuration. Adding an electron is unfavorable,making the electron affinity negative.$C$. $O^{-} + e^{-} \rightarrow O^{2-}$. Adding an electron to a negatively charged ion $(O^{-})$ experiences strong inter-electronic repulsion,making the process endothermic (negative electron affinity).$D$. $Na (3s^1)$ has a low energy orbital available. Adding an electron releases energy (positive electron affinity).$E$. $Al (3s^2 3p^1)$ has an available $3p$ orbital. Adding an electron releases energy (positive electron affinity).Therefore,the processes $A, B,$ and $C$ have negative electron affinity values.

The electron affinity values are negative for:
$A$. $Be \rightarrow Be^{-}$
$B$. $N \rightarrow N^{-}$
$C$. $O^{-} \rightarrow O^{2-}$
$D$. $Na \rightarrow Na^{-}$
$E$. $Al \rightarrow Al^{-}$
Choose the most appropriate answer from the options given below:

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The electron affinity values are negative for:$A$. $Be \rightarrow Be^{-}$$B$. $N \rightarrow N^{-}$$C$. $O^{-} \rightarrow O^{2-}$$D$. $Na \rightarrow Na^{-}$$E$. $Al \rightarrow Al^{-}$Choose the most appropriate answer from the options given below: