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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:

Similar Questions

Which of the following has the highest electron affinity?

Among the following options, the correct trend in the electron gain enthalpy is

Which element in each of the following pairs has a more negative electron gain enthalpy?
$(i)$ $O$ or $F$ $(ii)$ $F$ or $Cl$

Explain the following :
$(1)$ $Pb^{4+}$ acts as an oxidizing agent but $Sn^{2+}$ acts as a reducing agent.
$(2)$ Electron gain enthalpy of chlorine is more negative as compared to fluorine.

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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: